I thought it was absolutely brilliant. I'm having trouble summing up my thoughts on it, to be honest (I only got back from it about 45 minutes ago), but it was an incredibly tense, yet deep and thought-provoking experience. Easily the best movie I've seen so far this year, that much is certain.
Beyond that... well, I think I need to see it a second time before I'll be able to say anything much else deeper about it. I can tell you that Christopher Nolan is amazing, and I cannot wait to see more from him: Batman 3 and beyond, I trust it will be incredible.