I guess Full Throttle is almost the only one which qualifies for a good movie adaptation, IMO, so I vote for it. That is, if it's not about some animated movies or a fairy tale.
However the actual game I would love to see being made into movie is Fallout 1. I know, there've been a lot post-apocalyptic movies around all the time, but with exception of
The Book of Eli I couldn't find one that would come even close to the unique mood that is (was) created in the first Fallout. Made to resemble the original story close enough along the original lines, while leaving freedom for creating own twists, made with love for, and thorough knowledge of what is created, I'm sure the movie could score at least a good hit.