Agreed. I've said it before but honestly, for me, Billy Dee Williams was the best casting choice for Harvey Dent EVER, black, white, or otherwise... but I can't think of any other black actor right now, honestly, whom I like as much for the role. I mean if they cast a black man as Harvey, it's gotta be because he would totally own the role - the way Michael Clarke Duncan was the best possible choice for Kingpin (and he was, let's be honest).
As much as I like Laurence Fishburne, and Denzel Washington, I can't really see either of them as Harvey Dent. Denzel would be better than Fishburne, though. But whomever plays Harvey needs to be a REALLY smooth operator.