I liked it. I liked _Best in Show_ better (maybe it was funnier because I work with overprotective pet owners all day) but I was impressed with the music. I'm not even that big a fan of that era of pop/folk stuff but I thought that whoever did the music for the movie did a terrific job of capturing the "sounds".
I thought _Songcatcher_ was a yawn; predictable, melodramatic, and patronizing, although I did like a lot of the music. I liked "O Brother", too--I actually liked the movie better that the soundtrack--although not as well as some other Coen Brothers stuff.