An excellent rundown
courtesy of Matt Compton. I suppose this is an obvious point to make, but you've got to assume that some of the states who were so eager to move their primaries up to February 5 are having some regrets right now. New Jersey just kinda got lost in the shuffle back in the day as a Clinton quasi-home state, but if they had an April 8 primary we'd all be hearing about the unique challenges facing the Garden State right now.
This article available online at:
http://www.theatlantic.com/politics/archive/2008/03/an-nc-primary-primer/44011/