Here's one mildly tangible way I can help out with Katrina...
Rainbow relief for GLBT vic's of the disaster.
Mind you, my cynical side is saying a) No one's going to take me up on the offer, and b) I'm cheaply amused how many folks are posting housing openings like personal ads...
But still, Offering my couch up for someone who's been flooded out at least makes me feel like I;m trying to do something.