Whilst searching FPSbanana site, I came across a wideScreen 'fix' :
"CoD4 has support for widescreen resolutions, even aspect ratios.
The one thing the game does not also take into consideration though is the FoV (Field of View)."
http://www.fpsbanana.com/tuts/5173
All it does is change the (FOV) field of view value from 65 to 80 (or anything you want below 80) in the config_mp.cfg
From what i can see, only one person had issues of PB (Punkbuster), but everyone else has had no issues (see the comments), and I have been running it for a week now and all is fine, but thought I would post it hear first, in case it is seen as being an issue.
If you do use it, back up your profile first (just in case)!!
Cheers,
Snokes
Mmmm, mine was already at 80. :g: And no, I haven't messed with previously.