I wouldn't mind a TV series or movie trilogy based on the Coldfire novels by C.S. Friedman. Gerald Tarrant and Damien Vryce make up my favorite character pairing.
I think that (those) would be pretty damn good movies. I only read the first book, but I think they could make a good movie out of it pretty easily.
That said, there aren't a lot of books/games/TV series that I would want to be adapted into movies because movies often ruin the original for me, even if the movie is actually good.
Starcraft would be my number one, followed by the Coldfire, probably. I think the Half life or the Portal series might not be too bad if made into movies. I'd also like to see a Deadspace movie that's live action and not animated.
Most games and TV series that I can think of would just make messy and overall bad movies.
Might not work as a movie, or maybe if it's one movie per chapter or something.. but I'd love to see a movie version of Alice: Madness Returns. Wouldn't pass up a movie adaption of American McGee's Alice either