KAYE TRAMMELL has an open comment thread for people looking for news and information about survivors.
Also, here’s the Hurricane Katrina help Wiki.
Craigslist is running a lost and found list for friends and relatives. It also includes posts from people who want to help.
I’m not sure why, exactly, but more than anything else, reading the entries brought tears to my eyes.
Read this, too.
UPDATE: Here’s another Katrina missing persons board.