And wow....as wonderful as Heath was (and he was GREAT) Aaron Eckhart's marvelous performance as Harvey/Two- Face should not be overlooked...he gave new dimensions to an already amazing character (my all-time favorite Batman villain, even more than the Joker). In some ways Aaron's job was even harder than what Heath had to do, since at least Heath had other screen interpretations of the Joker to draw from (as radically as he reinterpreted it, or course). Other than Billy Dee Williams' limited (no fault of his own) depiction and Tommy Lee Jones' cackling Harvey Dent, Aaron had to more or less come up with a whole new interpretation on his own.*
(*I actually am somewhat of a fan of Tommy Lee Jones' Harvey Dent/Two-Face; even with all the over-the-top theatrics, there were moments of a deeper insight such as his final exhange with Bruce. But Aaron's Harvey captured the true essence of the comic book character for the first time ever in a live-action film, and gave Harvey new depth as well--no mean feat.)
OK....this movie is so good but I have three VERY minor quibbles:
1.) For some reason we don't really see anyone reacting in the horrified way you'd expect when first seeing Two-Face,; they look "upset" but you don't see the natural (inevitable) shock you'd think someone would show after seeing someone else with half their face burned off and part of their skull visible.

Maybe Nolan felt that to do that would take away from the brooding/philosophical tone of the film, but still--I'm not asking for an '89 Joker/Plastic surgeon kind of scene, it just felt like--and maybe this was intentional, I don't know--people who see Harvey for the first time after the accident, particularly the bartender--kind of take it in stride. You can see the guy's eyeball rolling out and the bones in his head, but no one really blinks an eye....still, that makeup job was amazing, hope it at least gets nom'd!
2.) As great as Harvey's part was written, I kind of wish we'd seen more of his own reaction to his transformation--it seems like he's more consumed (understandably) with Rachel's death--but still, I wish there had been some kind of scene where he first sees what he looks like, but in a way it does have more of an impact when we, the audience, see him for the first time like that.
3.) Eric Roberts.....ummm. I dunno.

He just didn't feel right for some reason. All I kept thinking of was when he played The Master in the '96 Dr. Who film.

The part was kind of underwritten anyway.