Nah, you're not going to be seeing impeachment hearings. Mostly because if there's one thing Dems hate more than the idea of Bush in the White House, it's the idea of Cheney in the White House.
Look to see more in the way of investigations re: Rumsfeld than direct attacks on Bush.
What's to stop them from going after Bush AND Cheney? Can you say President Pelosi?
Don't mind me, I'm still numb from yesterday.
Others have already responded to you: they'll impeach both.
But it won't do them any good - they don't have 2/3rds in the Senate.