I saw a press screening of this film recently, and was highly impressed by its moving account of the period in Truman Capote's life during which he wrote 'In Cold Blood'. The direction by the relatively unknown Bennett Miller is personal, evocative and affecting, but without being over-dramatic or saccharine. This is helped immensely by Philip Seymour Hoffmann's incredible performance as Capote, as well as solid acting from Catherine Keener, Clifton Collins Jr., and Chris Cooper. Cooper plays K.B.I. Agent Alvin Dewey with perhaps a bit too much intensity, given his relatively small amount of screen time, but the portrayal nonetheless comes off as heart-felt.
The cinematography by Adam Kimmel is suitably gray and moody, with many evocative views of the flat Kansas plains, but most of the screen time is spent with the camera focused on Hoffmann - all of it time well spent.
While I haven't read the biography by Gerald Clarke on which it's based, the script seems to hit enough salient details to evoke Capote's frame of mind, without inundating the audience with more than would fit in a feature-length film. I suppose one of my only complaints about the film would be that at times the conversations take on a sheen of Hollywood, saying things for dramatic impact that perhaps might not have been said in real life. But then again, I never met Capote, so who knows for sure.
All in all, this was a deeply engrossing film, and one I would highly recommend, especially if you're a fan of Truman Capote.