On "The Dark Knight"

I just saw the theatrical trailer for "The Dark Knight" on YouTube. You might want to wait till you see the trailer in the theater or until someone posts something of better quality, but, from what I could see (which wasn't much), it looked like Heath Ledger could be a better Joker than Jack Nicholson was. From what I could deduce from the preview, he brings a much darker disposition to the role, kind of like Ian McKellan's Richard III to Lawrence Olivier's.