Like The Batman himself, I'll keep this brief, and to the point: Go see The Dark Knight. Now!
This is probably the best Superhero movie ever made. That may be the post-Midnight Screening fanboy adrenaline talking, but for once the hype wasn't hype. And I know I said the same thing about Superman Returns, but this time I'm right. Heath Ledger's Joker is a force of nature, and will most definitely leave you wanting more.
So what are you waiting for?