supergroups

I was telling Bryan about The Ben's (Ben Kweller, Ben Lee, and Ben Folds) and so he in turn informs me about The Thorns (Matthew Sweet, Shawn Mullins, and Pete Droge). I'd go with The Ben's being the more interesting to my ears but it does bring up an interesting topic - what combined artists would make a great supergroup? Even if it's just for one album (a la The Replicants).