David Bernal, a.k.a. "Elsewhere". The newest iPod commercial features this guy who's style is totally unmistakable. He's the second dancer, when the background turns green, also the very last, and 3 times during.
You may recognize the fluid, biokinetic and sometime kinda freaky movement from the Volkswagen Gene Kelly remix of "Singing in the rain". In that one the CG artists mashed up ol' Gene's dance routine with movements from "Elsewhere" and two other dancers.
Otherwise you may have seen him in one of a couple of "video memes" that have circulated in recent years. Interesting guy, not only for his moves.