It looks like a combined effort has won the Netflix Prize, with a 10.05% improvement. The winning team, BellKor's Prgmatic Chaos, is a combined effort from AT&T, Commendo, Pragmatic Theory, and Yahoo! Research. There's a funny post about how they picked the name of the team (I personally liked "Show Me The Money").
According to the rules, other teams have 30 days to submit a better solution, or the $1 million prize is going to BellKor's Pragmatic Theory.