Jimmy Wales on Cooperation in Wikipedia
"Jimmy Wales, the founder of Wikipedia, lectures on how cooperation works at Wikipedia."
Available through http://www.cooperationcommons.com/resources
Jimmy Wales at TED 2006 (however: the video lecture seems to take place at the Oxford Internet Institute)
"Jimmy Wales explains how Wikipedia's collaborative system works, and why it succeeds."
The Intelligence of Wikipedia from the Oxford Internet Institute.
"Wikipedia founder Jimmy Wales explains the history and growth of Wikipedia with a particular focus on the internal community process which ensure a constant growth in quality." (http://webcast.oii.ox.ac.uk/?view=Webcast&ID=20050711_76)
See also the Webcast with Jimmy Wales on Wikipedia's Governance