Guy also has a great DEMO guide if you are about to present over there...

"Bring two of everything. There is a place for duplication: equipment. Expect everything to break the night before you're on stage, so bring two, maybe even three, computers, phones, thumb drives, whatever you'll use in your demo. There is zero slack for equipment failures at Demo other than the projector and audio (which are the responsibility of the Demo folks).

Get organized in advance. You should never futz around in a demo--for example, looking for folders and files on your hard disk. You have weeks to prepare for these six minutes; you're absolutely clueless if you haven't set everything up in advance.

Reduce the factors you can't control. Should you assume that you'll have Internet access during your demo? Yes, but have a back up anyway. Sure, the hotel has a T1 line, but several hundred people in the audience are accessing it. You can count your lucky stars that Verizon has EvDO service in Phoenix. Better yet, simulate Internet access to your server by using a local server.You don't have to show the real system. This, after all, the demo."

DEMO is one of the best events I can think of - very well organized, great atmosphere, great audience and real demos not just Powerpoints.

We'll cover DEMO live here and in some other blogs in the network. So if you can't attend live you should at least subscribe :)