9:38 PM
I've seen phone numbers and email addresses announced on television for getting relevant information to NASA, but it looks like they've also established an anonymous FTP conduit.

William Gibson has posted a short but beautiful entry on his blog, "Columbia Sadness".

If you haven't seen it, Spaceflightnow.com has posted raw video and audio of the last minutes of the flight.

Matt Haughley's wholelottanothing has gone black, with the header "A Sad Day for Science".