The more you watch it the better it gets, plus it doesn't just rely on it's backwards chronology, there's a hidden feature on the dvd that lets you watch it chronologicaly forwards aswell, if you know what I mean, and it's still an awesome film.
I have a lot of respect for director Chris Nolan and it looks like he's going to direct the new Batman film, the Frightening, which should be quite good, saw the script the other day and it looks pretty dark...