This is one thing that really bothers me about Hillary in that role. Whatever happens, she's probably going to continue to be a very big voice in the area of getting stuff done, and I don't WANT the VP to wield as much power as it had under Cheney. Which is why I like Edwards. He could help shape things, serve as a voice of balance and conscience, but would not be vital to playing out the agenda.
That said, if McCain is going to pick Romney, I like Hillary better in that role.