If anybody saw Taylor Phinney on the Santa Barbara leg of the TofCalif this year, he descended like a rocket. I know he was seated on the top tube a lot and even had balls to turn around and look over his shoulder (all at over 70mph!!!!! Yes, I said SEVENTY MPH!!!)

Whatever it is he does, I'd suggest to mimic. It obviously works well.

I believe Chrisitan Vande Veld's comments were, "I've been on his wheel when he does this and I cannot stay. The guy is just insane on the descents!"