'No Country's' first Oscar

"No Country for Old Men" won Best Adapted Screenplay. It's probably not the only Oscar the movie will win tonight. Then another best song nominee from "Enchanted" was performed by a woman in ridiculously high heels.
A lot of this year's nominees are also presenters. Is that normal? Anyway, the nods to history seem to be well-placed and appropriate. I was afraid the whole show would be weighed down with look backs, but so far, that's not the case.