I must be the only one interpreting the ending differently than the "Blake/Robin becomes the next Batman" theory. Yes, I know Wayne's appearance with Catwoman at the cafe, not to mention Batman's faked death, implies that he's hanging it up.
But I don't get the conclusion that just because Batman invited Robin to a new/different batcave that he's passing the suit/persona onto a new generation. Instead, I think Nolan set up another film/future where both he and Robin fight crime together.
I mean, why fix the bat signal for Gordon if you're not coming back?
The second thing, I absolutely love how Nolan handled villain/side-kick backstories and kept all of them well within the confines of 80% realistic universe, rather than just having costume-wearing buffoons (and where Batman is really the only one that actually dresses up). I like that he doesn't really have to name them, Scarecrow, Joker, Catwoman, Two-Face, Robin. We all know who they are, but he leaves them in a realm where we believe they might actually exist. I dunno, I think it's a fantastic touch.