CNN is reporting that Edwards is done. I think this is bad for Obama, but I guess we'll see where his vote goes. Edwards is more likely to endorse Obama than Clinton, so of course there's that.
... I'll just add that Edwards did have some effect on this race. He pushed and prodded a bit and injected some economic populism into the election, and he was helpful in a variety of fights we undertook, such as the Fox News fight and the FISA dispute. While he did run slightly to the left of the other candidates, my sense is that his presence as a progressive champion was overstated because he could never convincingly explain why he had shifted from his track record as a fairly moderate Senator to a harder edged candidate. That said, I'm glad he was in this, he did some good, and I hope he lands a spot in the next administration somewhere. It's always good when someone who has had such sustained contact with voters for so long is moved into a position of authority.