Missed this the other day, but Markos Moulitsas of DailyKos fame says he'll vote for Obama. Although that should carry some weight with the liberal netroots, it's not quite the endorsement you might expect:

That doesn't mean I think Obama walks on water. Far from it. The guy is going around idiotically attacking Paul Krugman, dancing with homophobic preachers, and while his rhetoric is beautiful upon first listening, an hour later you're left wondering if he said anything of substance at all (and the answer is usually "no").

But this became "process of elimination" for me. I don't "support" Obama, I just plan on voting for him.

Maybe that's why I couldn't find any reference to this on Obama's site.