WikiLeaks usually posts classified government documents, but today they're posting an archive of text messages sent and received on September 11, 2001.
Beginning at 3am this morning and continuing until 3am Thursday, the messages are being released synchronized to the time of day they were originally sent. It's a fascinating and oddly gripping glimpse at regular life that morning, and then the unbelievable chaos that ensued.
In the archive, you'll find everything from reminders to bring home groceries after work to to news updates on the attacks to pleas from a loved one to call home with news of their whereabouts. You'll also find what appear to be text ads, and automated communications from computers and servers. The full archive will be available tomorrow, in the meantime here's a sample of the messages posted (with emails and phone numbers removed):
2001-09-11 09:30:54 Skytel  A ALPHA THE WORLD TRADE CENTER WAS HIT BY TWO PLANES. TURN ON THE T.V. IF CAN. PS... THE FURNITURE ARRIVED AND LOOKS GREAT. IRIS
2001-09-11 09:49:16 Skytel  A ALPHA Joanna.firstname.lastname@example.org|| All Troopers please be on standby for deployment. Capt. Delaney
2001-09-11 10:55:06 Arch  A ALPHA I am now calculating how much mo
2001-09-11 10:55:08 Arch  A ALPHA ney I am going to collect from your life insurance policies because..if you don't call me now!! to tell me you're not dead, I am going to kill you! 
2001-09-11 11:13:17 Arch  A ALPHA Please call me I am panicking. I am starting to make your funeral arrangements.
The full archive will be available at http://911.wikileaks.org