Steven Sinofsky, Scott Guthrie and Kurt DelBene were the top speakers announced for day 2 keynote.
If you would like to watch the keynotes on-demand, you can do so at www.microsoftpdc.com site.
Scott Guthrie announces the public beta of Silverlight 4. The beta can be downloaded at http://www.silverlight.net/getstarted/silverlight-4-beta.
Extended out-of-browser capabilities to enable deeper desktop [...]