Important: If you give to the Red Cross, make sure you earmark your donation for Hurricane Katrina relief! If you don't, it goes into their central fund and can be used to buy things like photocopiers. Seriously.
To make sure your money goes where you want it to, specifically earmark it for Hurricane Katrina Relief.
One way to do this is to donate through Amazon.com; they'll stick it in the right place, looks like.
Click here to donate.
The Humane Society
Humans aren't the only evacuees; many pets have been rescued. The Humane Society of Southern Louisiana will be needing some help, and jinzi has organized a blogging drive to get them that help; see details on her LJ and here!
America's Second Harvest
See here for details!
See creentmerveille's LJ for details!
Not all of us can. If you can, please do.
If anyone has any other suggestions, any other organizations I should be spreading the word about, please let me know!
EDIT: Oh yeah! If you do donate, send me your receipt (shadesong AT gmail.com), and I'll send you the Blogathon story and creator-commentary stuff. It's a different charity, but it's still charity. *nod*