I also didn't pay a lot of attention to Biden until the debate, and yes, I was impressed with his delivery. I realize, of course, that he also practiced and was coached extensively for this -- for example, I noticed he was careful to smile in a very friendly manner every time Palin said something especially obnoxious, probably as a reminder to himself not to attack -- but he seemed very comfortable with the facts he offered, as though he really knew them rather than having memorized them.

And yes, his reaction to the idea that the VP has a legislative role was impressive.