The following is copied from the readme.htm file after installing the patch:

Last updated 21 – May - 2007

V2.13

• Ship combat odds no longer affected by crossing a river
• Game no longer crashes when you load a save with the diplomacy screen open
• Fixed bug where ships could sometimes attack ground units
• When the user is the last human player in a multiplayer game, the retire option now works properly
• Forts act as cities only if they within friendly (ally or vassal) to the defender borders
• GameCore DLL no longer loaded from CustomAssets folder. Mods can still have their own DLL
• Fixed pop-rush rounding bug
• Fixed absenece of production popup for conquered city under certain circumstances
• Fixed multiple missions exploit from the same Great Person
• GNP graph shows total commerce generated, not only raw commerce
• Just one Cathedral required for OCC
• Barbarian Spearmen and Galleys appear as intended
• Fixed crop yield history reset on load
• Fixed removed spy teleportation mission :-)
• Fixed hotseat tech chooser bug
• Game no longer hangs when you retire from a one-player hotseat game
• Widescreen Laptop video resolution 1280x720 is supported

 Vassal States

            No longer possible to receive a request from an AI to declare war on one of his vassals (!)

            Vassals can no longer accept one-sided defensive pacts (!)

            Fixed happiness from vassal issue

            You can now airlift into cities of your vassal

            You don't pay supply costs for units inside your vassal's borders

            Can no longer ask someone to make peace with a vassal. Talk to the master directly.

            Vassal AI improvement

            When you declare war on a vassal, you also declare war on the master (instead of the master declaring war on you)

            Vassal AI no longer makes *all* their gold available for trade.

            Vassal AI never refuse to talk to their master

            AI better considers war consequences of accepting a vassal

            Vassals no longer freed when master forms a permanent alliance

            - Fixes the vassal/defensive pact exploit

            Master/Vassal AI attitude reflects the implicit defensive pact of a vassal agreement. 

            Master/Vassal AI no longer give each other negative attitude modifiers for close borders.

            Vassal AI does not get upset because of Master's defensive pacts with third parties.

            Vassal cannot own plots within the city radius of his master's cities unless those plots are closer to his own cities.

            If you have a peace treaty in effect with someone, you can no longer declare war on their vassals either.

            Adjusted negative AI attitude for having vassals

            AI no longer refuses to become a vassal because of "your lands too far" when you are actually neighbors

Great Generals

            When a generic Great General is attached to a unit, the unit is no longer given a TXT_KEY name

            Great Generals experience threshold scales with the ratio of Great People threshold to unit production rate

            (so the threshold is the same at all speeds except Marathon where they require 1.5 time more experience)

Multiplayer

            Anonymous play: real player names revealed on game end

            Fix for anonymous mode not being always anonymous

            Fixed some more anonymous play issues

            - You can no longer see other player's names in the staging screen for loading a save

            - You no longer see the player ID for "waiting to hear from..."

            Fixed selection issue in simultaneous MP for recently-moved units

            Now possible to join a Pitboss game where only AI are left

            Fixed Pitboss not-ready-to-launch bug

            Pitboss no longer crashes when launching as players are joining

            Pitboss no longer crashes when large amounts of text are spammed into the chat box

            Don't allow launching the game with players still in the civ selection screen

            Fixed MP crash when player is eliminated with the trade screen up and performs a trade

            Switched to new GameSpy SDK

            No autosaves generated for PBEM

            Innocent units are no longer penalized when another unit moves near the end of the turn timer and stays selected

            Added "logging enabled" warning for MP

            LAN: No longer possible to spam the network with game refresh requests

Graphics

            Fixed non-shader version of Mehmed

            if too many individual plots need globe rendering, redraw entire globe texture for performance

            Hooked up modern harbor graphic

            Fixed issue where combat zoom did not happen after you just clicked "yes" on the popup to declare war.

            Possible fix for grid crash.

            Kublai / Qin swap

Interface

            Combat odds greater than 99.9% are displayed as such (not rounded to 100%)

            Combat odds less than 0.1% are displayed as such (not rounded to 0%)

            Active resource deals (1 of X) display the correct number for X

            Diplomacy screen: leader attitude once again shown at the top

            Regenerating the map resets the statistics in the Info screen

            Plot indicator rotation no longer gives away your location on the map (north-south hemisphere)

            Fixed Python exception in plotlist mouseover help

            Fixed watermill and workshop tooltip

            Mission queue is no longer cleared after the selection group has used up all its movement from a previous mission

            Fixed cursor location for windowed maximized mode.

            Rally points now work with autopromote

            Canceling a deal in the diplomacy advisor no longer affects the state of any existing diplomacy screen

            Fixed erroneous score display in city screen for games with over 20 number of players

            Foreign advisor: leaderheads no longer cut off when tech or resource trading not possible

            Great Person city bar mouseover shows turns left

            Your cities can now have the same name as an existing city of another civ (to prevent renaming to expose your AI opponents)

            Civ name appears after city names when captured and when Great People are born

            (to avoid confusion now that duplicate names are allowed)

            City selection: Shift-clicking on a selected city de-selects it, just as it works for unit selection

            Fixed sorting bug in Domestic advisor

            Improved performance for large selection groups

            Fixed F6 screen update issue for PBEM

            Fixed civilopedia display for buidings that give raw food/production/commerce/gold/science

            No more warnings for animals at your borders

            No more '&' allowed in player and city names (special character)

            Globeview unit indicator and help text show up correctly for plots with more than one unit

Sound

            Fixed SAM noise issue

            Fixed a sound bug

            Added audio to enemy unit warnings

            Stalin gets Peter's diplo music, not Catherine's

            Fixed audio crash on reload

            Diplomacy music was slightly too loud for new leaders

AI

            AI no longer chooses state religion civics if it has no religion

            City governor no longer overly starves a city when there is not enough food

            Fixed a couple more issues with the city governor

            AI no longer dumps their entire nuclear arsenal on the barbarians

            Fixed bug where AI would sometimes accept trades for your worthless maps

            AI builds bunkers more urgently

            AI city placement improvement

            Improved AI use of 'emphasize' buttons

            Pop-rush and draft AI improvement

            Worker AI improvement

            Improved civics AI

            Tweaked AI building priorities

            Fixed AI accidental war declaration (running into submarine)

Balance

            Increased trebuchet cost to 80

            Quarries give +1 shield with railroads

            Expansive gets +50% production for workers, and just +2 health

            Navigation II requires Flanking

            Leadership gives double experience points

            Stables obsolete with Rocketry (when mounted units upgrade to Gunships)

            Siege units no longer defend after other less powerful units in a stack

            When gifting a unit to a charismatic leader, an experience adjustment occurs. 

            (Prevents exploits of gifting units to a charismatic teammate just for them to promote and return them)

            Removed balanced resource option from Mirror mapscript

            Creative gets cheap Libraries

            Organized gets cheap Factories

            Jaguar gets Woodsman promotion instead of 25% jungle defense

            Bureaucracy: High upkeep

            Representation: +3 Happy in largest cities

            Civil Service requires Mathematics

            Pyramids cost 500

            Colosseum and Odeon cost 80

            Masonry has higher religious weight

            Mall: +20% gold

            Guerilla3 gives +30% withdrawal in addition to hills attack bonus

            Walls give 25% protection to bombardment (so they are relevant even in high-culture cities)

            Castle gives 25% protection to bombardment

            Spanish Citadel gives +5XP to siege

            Heroic Epic available with a level 4 unit

            Shrines immune to nukes

            Gallic Warrior can also be built with Copper

            laceName w:st="on">MilitarylaceName> laceType w:st="on">AcademylaceType>: +50% production for military units

            laceName w:st="on">MilitarylaceName> laceType w:st="on">AcademylaceType> requires Education

            laceName w:st="on">MilitarylaceName> laceType w:st="on">AcademylaceType> gives 3 culture

            Oracle, Stonehenge, Great Wall no longer available in Classical starts

            Great Wall gives just 1 Great Person point per turn

            laceType w:st="on">TemplelaceType> of laceName w:st="on">ArtemislaceName>: reduced cost to 350

            Barbarians can have Spearmen

Misc bug fixes

            Fixed first strike chance bug

            Enemy spies no longer visible from GlobeView!

            Barbarians can no longer build any of the Wonders

            Fixed potential crash

            Old .Civ4WorldBuilderSave files are recognized and loaded

            Can't gift a unit if the recipient is over the limit (missionaries, spies)

            Units cannot jump into enemy territory when expelled

            When you lose a Wonder race and you have a Settler/Worker queued up next in that city, you no longer get food counted both in the food and production boxes.

            Fixed crash with flip of city that contained troops loaded into a transport.

            Fixed several other potential crashed of the same type.

            Fixed crash bug

            Fixed bug with research overflow

            Fixed load unit into transport crash

            Fixed selection group cycling crash

            Can't capture Greek Odeon (gives culture)

            Raised Worldbuilder culture limit from 1000 to 100000000

            No longer possible to bombard a city with zero defensive modifier

Text

            Fixed Stonehenge strategy text

            Updated credits

            Fixed typo in Hannibal civilopedia entry

            Fixed inaccuracy in Great General civilopedia entry

            Fixed Pavilion spelling

            Updated Celtic city list

            Fixed Louis diplomacy text bug

            Egypt civilopedia text fix

Modding

            Updated PythonHelp feature

            exposed getCurrentEra to Python

            Added some missing python auto-doc information

            Added Python override to prevent razing of a city

            Leaders with no favorite civic appear in civilopedia

Genghis Khan Scenario

            Removed Pinch promotion

Chinese Unification Scenario

            Can now build Galleys in all 'river' coastal cities

            Imperialist Trait now grants 50% Settler production bonus as expected

Alexander the Great Scenario

            Reset Variables at the beginning of the game; fixes the 2 Alexander if the scenerio is restarted.

            Scenerio->Scenario

            Only available for single-player games

Peloponnesian War Scenario

            Non-english text fix for Peloponnesian War

Vikings Scenario

            fixed bug where Red marking circles did not show up after loading a save

Omens Scenario

            Player can no longer gift Missionaries to the AI to convert them to their religion and win easily

http://www.firaxis.com/support/support_detail.php?gameid=13&patch=1

(Thinking of the DGame here...)

I did get that d3dx9_32.dll error when I 1st installed it, and for some reason, when I tried the above link, it said I was updated to the current 9.0c (was already at 9.0c before) and I still kept getting the error.

Also, I was getting "Error loading Shader Libraries" errors, which was supposed a Direct X error as well.

Thanks to our friends at Civfanatics, I found others that had the same problems as me after using Tosk's DirectX update link above.  If you are getting those errors and the above update link doesn't work.  You might want to try this:   http://www.microsoft.com/downloads/details.aspx?familyid=B406CF67-D926-463B-99E8-27199D6626B5&displaylang=en

That installs the whole DirectX rather than attempting to detect what you're missing.  THAT worked for me and I was able to play.  What a pain, huh?

Hope that helps. 

EDIT:  BTW, the d3dx9_32.dll/Shader Libraries errors occurred only after installing the Warlords patch and NOT the CIV IV patch 1.74 released the same day.  That worked fine for me.