First, people are actually talking about him. He's on Meet The Press, and being talked about everywhere. His remarks are not particularly brilliant, and not even particularly shocking that someone like him is saying things like that.
It seems like Fox News and the rest of the Republican Party are actually taking the bait. Instead of ignoring the Democrats which is what they usually do, they're talking about how crazy and out of control Dean is. You may notice that Dean's remarks, although strident, are nowhere near out of control. (Telling Patrick Leahy to fuck off on the Senate floor, well, that's my definition of out of control.)
Dean is taking his public image of a crazy man from the screaming incident (which in and of itself was blown out of proportion) and he's utlizing it to get additional publicity for the Dems by making some incredibly obvious remarks about Republicans that are getting them all defensive and uppity, forcing them to talk about that rather than their own agenda. It's exactly what the Republicans have been doing for over two decades. A few more months of Dean knocking the Republicans off balance, he'll have the floor, and he'l start making real comments about the issues and he'll have people listening.
You've also got some of the Dems in congress sort of disavowing Dean. I'm not sure if that's part of the strategy (let Dean be the person who can say all the things everyone else can't, while saying "he doesn't speak for us" when clearly, as party chairman, he does) or if they're just being wussies. If the former, brilliant; if the latter, they're fools but I guess I understand because it's been so long they've been living in the shadow of Republicans thanking them for whatever crumbs they can drop as they continue their rapacious dismantling of all that is good in this country that the congressional Dems might have lost a touch of backbone.
Meanwhile, behind the scenes, Dean's rebuilding the party infrastructure, giving money to states, getting small donors in line, and generally doing to the DNC the things he did to his own campaign, which despite its sudden end, was a model of things to come.
I think things are getting interesting.