Ethan's gathering people to go through posts on a variety of message boards being used to track missing/found people post-Katrina. Volunteers are needed for data entry. I'm busy working with Ethan right now, writing scripts to pull in more message board posts.
More details on the project here.
From what I understand, helping people to find each other is one of the best things you can do remotely, short of giving money. So, if you have some time this Labor Day weekend and have been looking for a way to pitch in, consider this project!