I tried the widescreen fix and this was my experience:
@Damni it works (play around with your scaling settings if it don't) and it is nice to have it full screen without stretching the image. However, there seems to be a sort off "fish eye lens" effect I am not sure I like, it is more noticeable on open maps than in enclosed maps like buildings.. Also, the scope on rifles is different because you lose the "tunnel vision" and can still see around you. Some may like that because it gives you an advantage and more peripheral awareness (cheat?) while aiming scoped but kills immersion a bit.
We also have the VooDoo3D solution which I used before. Also makes the game full screen and with higher resolutions but stretches the images. But other than that it does not distort anything like the widescreen fix does. The widescreen fix makes the main menu a bit torn up making it harder to replace uniforms and such, also some camera angles you can watch before entering a map are screwed up. No game breakers, we are just still waiting on the perfect solution
The Voodoo3D solution can be downloaded
here in our files section.