Memento is cool. I know that some friends of mine, all have studied psychology, had to watch it. In the 'thinking' genre I liked Lord of War, The Constant Gardener and District 9. I totally believe Ol' Pete had a message with that one.
Recently went to see Green Lantern and Captain America, the First Avenger. They were ok. Liked the last one better than the first. RED was funny. I didn't like Wall Street that much and I need to see the latest Harry Potter...still