Palin is doing a whole lot better than people assumed she would do going into this. I honestly think that she is doing a pretty good job all in all.
That said.
If her expectations were not as low as they were, I think Biden is edging out a close debate (well maybe not that close... there is a lot of side bars to her answers) but, again, knowing the low expectations, I question how this will play out with "Joe Sixpack" (Palin's words).
Another thing... she is doing a GREAT job of dodging questions. I don't know how that will play out with viewers but she is really not going deep with any answers.
Also, I have never seen a debater look more coached. That doesn't mean she isn't making a stand on stage, that just means I can SEE the flashcards in her eyes as she is answering.