"Whisky Heaven" (I'm hosting this to alleviate pressure on his website but it was downloaded off his website - there are several more there)
Jason has more at One Louder...
UPDATE: And now R. L. Burnside is reported dead in Memphis - unrelated to the hurricane, of course, but still a terrible blow to the music world. Squeeze My Lemon has a report. Arggh!
UPDATE to the above UPDATE (Sept 2): Dante has links to other music blogs discussing Burnside's legacy and loss. Also, slightly off subject, Squeeze My Lemon has a post on Katrina and links to others doing more heavy lifting.
UPDATE: Apparently Fats was rescued but 'missing'. But, The Stranger's Slog reports he was seen in the Superdome:
Stranger photographer Victoria Renard (and former NOLA resident) reports that Fats Domino has turned up at the Superdome.