Since many attendees of the german blogger conference re:publica in Berlin are avid Twitter users, I'm receeiving my own little live comment stream to my desk.
I can see what talks get positive or negative notions and how the conference is going as a whole. As a presenter at re:publica, I'd use this Twitter stream as a source of feedback to improve my presentation style, attitude and choice of topic
It's also interesting to watch attendees even make appointments over Twitter.
And I already have one very clear insight: at a blogger conference, there's one thing that's even more important than WiFi and power outlets for all the MacBooks: coffee Good coffee :-)
PS: For the non-Twitterati, there's also a TumbleLog and a Onelinr backchannel live from re:publica.