"To 'Warholize' someone else's photo ... doesn't fall within an existing category of fair use"

Prompted by the latest in the Shepard Fairey-AP lawsuit, Columbia lawprof Tim Wu presents Fair Use 101 over at slate.com. It's useful overview, but, as I've said before, I don't think anyone has any idea whether Fairey's poster was a fair use. Take a look at Wu's piece and see if you disagree.