US position on Darfur( in spite of the lack of UN support)

Afganistan

IMO, the attack on Iraq, removal of Saddam ( in spite of the tactical erros I think were made) and the subsequant ending of the Libyan WMD program

If you want to blame him for Katrina, then give him the credit for the Indonesian Typhoon relief.

Stopping further terrorist attacks within the US. (yes, there have been a number stopped, even if you don't want to admit it).