Guitar Player Mag has an article on looping and the new batch of loopers at NAMM this year. BOSS has upped the ante vs. Digitech with its RC50 and the Electro Harmonix 2880 looks interesting too. And each of those new ones has MIDI clock sync (unlike my Jamman, sniffle).
Actually that RC50 looks pretty sweet: XLR with phantom power, sampled drum loops, and that all important MIDI clock sync. Anybody want to buy a Digitech Jamman?