With Dries' keynote kicking off DrupalCon DC yesterday Twitter now knows what it is to be slashdotted.
#drupalcon has been the most popular tag since yesterday morning and Twitter's services were unavailable at some times during the day. Twitter's being used extensively to communicate between people at the Con. We use it when we're at our hotel, since they've blocked the IRC port. We use it at the Con to describe our deepest feelings about the sessions we just attended. We even used it during the opening keynote yesterday to display messages on the large screens set up there.
Just as they say on TV: "It's amazing, Mike!"