Not particularly sure where to put this since its a fix that works for many games, yes even punkbuster based games.

http://imk.cx/pc/widescreenfixer/

this nifty little tool fixes the aspect ratios that are in the games, and believe me, if youve been playin using the 16:10 or 16: option given to you in the game, youve been cheated, its just a 4:3 image (or slightly wider 4:3 image) stretched to fit your display.

http://img18.imageshack.us/img18/9217/011bi.jpg
this is a default 16:10 screen shot on cod4

http://img18.imageshack.us/img18/5571/012hu.jpg
and this is a true screen shot of what the game is supposed to look on your 16:10 display, and yes it fixes it for 16:9 display as well.

you can find a list of the supported games in the readme file you get from extracting but i will post them here as well.
--------------------------------------------------
Battlefield 2
Battlefield 2142
BioShock
Call of Duty 2
Call of Duty 4: Modern Warfare
Call of Duty: World at War
Call of Duty: Modern Warfare 2
Darkest of Days Demo
SEGA Rally Revo
Unreal Tournament III
Wolfenstein
--------------------------------------------------

I was so pleased to find this while reading through some stuff on maximum pc. Its getting irritating how devs keep cutting corners in the development of their games, and its not hard to fix these things, just a few simple digits need to be changed and thats it.

I also wanted someone to do this with MW2 for i would like to see it as well.

Who knows, maybe Infinity ward will try to remove this tool from being used as well in the coming days.

Edit: i wonder if this should be posted on the infinity ward forums, but i fear it would only cause them to just remove the tool from use even faster if they saw it.