What do schoolchildren in Berrien County, Michigan and scientists at the Supercomputing and Networking Center in Poznan, Poland have in common? They'll all be participating in the Megaconference worldwide videoconferencing event on 9 December 2004 (8:00 am to midnight EST, UTC -5). Participants from around the globe will join this interactive conference via videoconference over advanced networks, which will be streamed live for viewing by anyone with an Internet connection. Now in its sixth year, the Megaconference has been a hallmark event for learning about cutting-edge uses of videoconferencing. This year's program focuses on the theme "Let's Talk: Global Communications, Innovation, and Participatory Videoconferencing." Megaconference also pushes the state of the art in videoconferencing, allowing both H.323 and SIP software participants for the first time, with more than 300 sites and an estimated audience of more than 3,000 people worldwide, not counting those who watch the simulcast streams.