The folks at Power Line have a good post on how History may judge the Bush presidency.
Also, there was a "Oxford style" debate hosted by NPR Intelligence Squared, on the motion "Bush 43 was the worst president in the last 50 years"
The venue was upper west side in Manhattan so you can imagine the ideological leaning and it was reflected in the PRE debate poll of audience sentiment:
Audience supports the motion 65% to 17%, with 18% undecided.
Speaking for the motion: Simon Jenkins and Jacob Weisberg
Speaking against the motion: William Kristol and Karl Rove Moderator: John Donvan
Rove and Kristol are in the Lion's den and their performance was admirable, as were the 300 Spartans at the Battle of Thermopylae . The winner is judged by who best moves the undecided. I won't spoil it for you so you will have to check it out yourself.
You can view the transcript or listen/download the podcast here
I use ITunes to synch and download these debates to my IPod. Much better listening when you're stuck in your car than standard radio fare.