Here's another idea that I've floated here and there but never given its own post. This one's pretty simple: A large part of Dean's role as DNC chair should be that of a promoter. By this I mean that whenever another Democrat has an especially important message to get out and is being ignored by the media, Dean should make an address to underline and call attention to it.
I know this is far from the traditional role of a party chair, which I understand to be more behind-the-scenes fundraising and strategizing. But Dean is unique among all the Dems (except possibly the Clintons) in his ability to get media coverage, which is an absolutely invaluable counter to the Republicans' media stranglehold. Better yet, his blunt and confrontational style is exactly what the Dems need right now, not the mush-mouthed equivocation and appeasement that has garnered their current milquetoast reputation. A few well-timed "Joe Biden/Joe Lieberman/John Edwards does not speak for the Democratic Party" jabs wouldn't hurt either, but I emphasize "a few," and only when they wander off the reservation and start making Republican noises.
I say we ride the Ho-Ho horse as long as we can, until Howard Fatigue sets in, if ever. In the meantime, we need to build up a bullpen of firebrands to reinforce the message, take some of the burden off of Dean, and provide a pool of strong successors as DNC chair and/or voice of the Democratic party.