Amazon.com has already helped raise more than $12.5 million in charitable donations from customers in the months since Katrina hit Louisiana and Mississippi, and now they're embarking on another major fundraising effort for organizations like Habitat for Humanity, American Red Cross, Save The Children, UNICEF, Sidewalk Angels, and the Bush Clinton Katrina Fund. Starting today, and running every weekday until Dec. 20th, the site will feature "exclusive content" from the "Amazon.com A-List For Hurricane Relief," a batch of celebrities ranging from Tim McGraw (who launches the event by visiting the St. Bernard Parish City Hall near New Orleans) and Trisha Yearwood to Elton John, Paul McCartney, and Bill Clinton—anyone want to take odds on whether he'll be laying down some saxophone tracks for his special presentation?