On Halloween night of the first year that the Halloween kibosh began in the Castro, 2007, KRON 4 provided this coverage from the scene. There is an amusing bit with a very drunk woman face-down in the street, as well one indignant nun who would like everyone to know (perhaps including the police) that "this is our neighborhood!" (meaning the gays'). For more on what went down in 2006, see this article here.
Unlike Halloween '07, bars and restaurants in the Castro will remain open this year, but there will probably again be lots of cops and no street closures.