MacRumorsLive.com is our live-event domain which is used to evenly distribute load over many servers for these high traffic events.
Today it was simply used to mirror the front page.
Previously, there was a new live-webcasting system created by Knox. It is described in detail here:
http://www.macrumorslive.com/about/
Hopefully we'll be able to use the live-webcast system again. Perhaps at MWSF 2006. Apple's been really strict about live coverage of these media events.
arn