The Microsoft Disaster Relief Page was updated tonight with a statement about Hurricane Katrina.
Microsoft Response to Hurricane Katrina
Published: August 31, 2005
Every one of us at Microsoft is deeply saddened by the destruction of property and personal lives in the wake of Hurricane Katrina, and our hearts go out to the hundreds of thousands of people who have been affected by the storm and its aftermath.
This page has links to many different relief agencies, so this is a good place to start if you're considering a contribution.