Head on over to the awesome Quiet Earth and check out some trailers.
First of all a very graphic, violent game coming to the PS3, Prototype. I'm an X-Box guy myself but this trailer is worth watching- particularly if you like the post-apocalyptic, mutant, zombie genre. Think I Am Legend if Will Smith had mad super-parkour skills and the ability to grow blades out of his hands.
Next up is the trailer for Gamer, Gerard Butler's next movie. Basically, a new game has been created where the gamers use mind control technology to manipulate real people in battles. This one looks very impressive.
While you're over there be sure to have a good look around- Quiet Earth is one of the top movie websites around. There's an awful lot of great material there, not all of it related to the post-apocalyptic genre.