Microsoft has Project Natal and Sony has Wand... but i gotta agree Natal seems more spectacular and more innovative, the videos make me want to have one so bad :)
I've Surfacer with a 2 year old kid... he just loved to see the balls grow but didnt really understand how to play. Anyway another game to try: http://www.youtube.com/watch?v=HXTSrtgHR5k