I started thinking about this after the thread by thenewgreen about who the best movie villain is, which can be found here.
The year for me is 2007. Let's start with the movie No Country for Old Men. I've probably watched it at least 6 or 7 times now. Outside of that, the following films came out in that year, all of which I love and can watch fairly regularly.
There Will Be Blood Juno Zodiac Before the Devil Knows You're Dead Persepolis and (this one people disagree with) Dan In Real Life
2007 was an absolutely incredible year for film, and those are only the movies that immediately come to mind.
Did a quick search and forgot about the following: Ratatouille Encounters at the End of the World Knocked Up Superbad