Things from Lorwyn, Eventide, Shadowmoor, and Morningtide dominated the regionals here last spring. Jund decks can be quite fun to run. It's probably dominant because of the wonderful array of removal available to it. Maelstrom Pulse and Blightning come to mind off the top of my head. Oh, and then there's the devour mechanic and the insane amount of Saproling spawning cards available.