www.DenOfGeek.com has a list of 13 games soon to be getting the movie treatment. Having played most of the games these movies will be based on, I have to say I'm most excited for Kane and Lynch. The games story wasn't exactly groundbreaking, but the characters where very interesting.
On a side note, I'll also have to keep an eye on Devil May Cry and Halo because of their obvious potential awesome. Couldn't forget Metal Gear. Which I should be the most excited for. I just have a feeling that they're going to kill it. Keep your fingers crossed that at least one turns out good!
13 Games Being Made Into Films