Wikileaks has just begun to publish more than half a million text messages (from pagers) that were intercepted by an unnamed US agency on Sept 11, 2001.

They have launched a separate website for this project, that includes "official" messages from law enforcement agencies, as well as private messages in reaction to the tragedy. Also included are numerous automated status messages sent by crashing computer systems located inside the Twin Towers.

The messages will be placed on the website today at roughly the correspondent time frames of the attack itself. Commentary is welcomed by Wikileaks at a special forum over at reddit.
More info also at The Guardian and on over Twitter: hashtag #911txts and @WikiLeaks

My guess is that this will be a boon to historians, conspiracy theorists and information awareness activists alike. Especially interesting is the fact, that this kind of clandestine, universal wiretap has been going on since before the attacks of 9/11 that are often cited as the reason for such programmes.

Update: First Analysis over at CBS News:

It's impossible to tell whether the logs have been faithfully reproduced in their entirety. But there's evidence they have been: I spoke to three journalists working on September 11, 2001 whose correspondence appeared in the logs or who were familiar with the messages circulated in their newsrooms that day. All three say the logs appear to be legitimate.
This trove of messages is likely to become a boon for historians, a new source of concern for privacy advocates, and, depending on the details, a point of embarrassment or pride for the government agencies and corporations whose internal conversations have been divulged.