Looks like some videos from the Ubuntu Live 2007 conference in Portland have been posted: http://ubuntulive.blip.tv/

So far, the following videos are available:

Matt Asay (VP, Alfresco Software) - The Ten Commandments of Open Source
Matt Zimmerman (CTO, Canonical) - Ubuntu Technical Roadmap
Doug Fisher (VP, Intel) - Advancing Technologies Through Open Source
Marten Mickos (CEO, MySQL) - Video
Chris Kenyon (Dir., Business Development, Canonical) - Ubuntu’s Fierce Freedoms Lead to Striking Opportunities
Jim Zemlin (Executive Dir., Linux Foundation) - Video
Eben Moglen (Dir., SFLC) - Video
Jeff Waugh (Waugh Partners) - Video
Mark Shuttleworth - Video