From this page you can see live streaming of the keynote talks from the KDD 2010 conference.

• Mon 7/26, 9:00AM-10:00AM (EST)
  Data Mining in the Online Services Industry
  Qi Lu, President of Online Services Division, Microsoft 
  
• Tue 7/27, 9:00AM-10:00AM (EST)
  Computational Social Science
  David Jensen, Department of Computer Science, University of Massachusetts Amherst
  
• Wed 7/28, 9:00AM-10:00AM (EST)
  The quantification of advertising and lessons from building a business based on large scale data mining
  Konrad Feldman, Quantcast