As it turns out, I've got a few more things to say about the primary process. So here goes:
Brad Plumer thinks it'd be cool to implement Single Transferable Voting. I agree from a candidate selection perspective -- Brad has a few arguments to this effect -- and also from a fun perspective. Show me the Deaniac who won't feel raw pleasure in ranking Dean over Clark over Edwards over Kerry over Sharpton over Lieberman! Political junkies will enjoy having data about whom Hillary voters considered their second choice, and reading all the ranked endorsements that'll come out. The only disadvantage of STV is that it takes a little while to explain. But it's all fun fun fun after that.