Here's the thread that touches on it a bit...
http://horror.com/forum/showthread.php?t=53382
Terminator: Salvation
* Road Warrior - My dad showed this to me when I was wee, so it has a special place in my heart. Say what you will about silly leather-clad survivor stereotypes, that movie is a HELL of a lot of fun, fantastic, and great.
* 28 Weeks Later - I actually liked this better than the first one; I really liked the post-apocalyptic world that was created by the outbreak and how it creates a pure human horror.
* Planet of the Apes (1968) - Obviously a CLASSIC. Also shown to me when I was wee.
* Matrix - This was really the first movie that made me identify with a coward. Quite frankly, I'm with the guy who would rather stay in the Matrix than unplug into the real world... Though I wouldn't necessarily rat out humankind to do so.
* Land of the Dead - Not my favorite zombie movie, by ANY means, but like I said, I geek out over post-apocalyptic stuff. Love seeing the distopic landscape.
* Blade Runner - While not necessarily post-apocalyptic, I lump it into the genre because it DOES display a distopic future, which is a concept that post-apocalyptic movies definitely play into. I might lump The Crow and Dark City into this category too.
* Resident Evil - Like Land of the Dead, I don't necessarily like the movies as a whole, but I like the world that they create - I'm more interested in taking on the role of Alice and just letting myself go with it. It's how I feel about Terminator: Salvation. Some people here have said that it's an unnecessary sequel. I don't care. I just like seeing the distopic concepts; the robots taking over the water, for example since humans need water.
* A Boy and his Dog - Been a while since I've seen this one, but FANTASTIC.
* Night of the Comet - Post-apocalypse in the IMMEDIATE future... Overlooked classic.