I've seen the previews for Black Snake Moan. From what I gathered, the girl is on the run or an addict or something, and Jackson plays the wizened elderly black man who is going to help her overcome her problems through old time methods. Or at least it seemed that's what the plot was about. Hard to tell. There was some sexual tension between Jackson and the girl even in the previews, and in one scene Jackson is berated by another black for 'keeping a white girl' at home. "Nuttin' but trouble.."
This is another one of those movies where the roles could never be reversed. There could never be a wizened old white man who helps a runaway black girl overcome her addictions by keeping her chained to a tree. No way.
It's also another movie I won't be wasting any money on, either, although I'm sure every black person in the country will see it twice.