Simply browse to the Microsoft PDC website which advertises the streams as follows: "Watch the PDC2008 keynotes LIVE online on Monday and Tuesday from 8:30 AM- 10:30 AM Pacific Standard Time. Bookmark www.microsoftpdc.com and join Ray Ozzie and friends
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Read the complete post at http://blogs.technet.com/steve_lamb/archive/2008/10/26/where-can-i-access-the-pdc-keynote-streams.aspx