I spent my weekend lending technical expertise, performing volunteer greeting in cyberspace, and just general organizing for the Katrina Peoplefinder Project. From the wiki page:
Several dozen sites have been established to help survivors of Hurricane Katrina find their loved ones, and to allow people to report missing people. This creates a difficulty for people trying to locate missing persons - they need to search dozens of separate databases and message forums.
So we've decided to create a centralized database, where you can search the data from all of these at one time.
As of 9pm pacific, we've gotten 2200 volunteers to enter in 50,000 postings (i.e. translate free text postings into a structured database that will be searchable). Lots more work to do - see the wiki, the #globalvoices IRC channel (archive), or (for tech people), the #katrinadev IRC channel (archive) -- all on freenode. Additionally, there's a relatively high volume email list (katrinadev) that can be subscribed to here.
