The Canadian company EXOPC will be showing off their EXOdesk at the Consumer Electronics Show (CES) in Las Vegas in January. The 40-inch HD desk will be available to consumers starting in 2012, while the "HTML5 multi-touch development kit and the bi-directional application store" will presumably be open to developers sooner.
Link: http://www.youtube.com/watch?v=5dlUi3DnrzA&feature=player_embedded
Website: http://www.exopc.com/