If you have any Visual Studio 2010 Beta 1 extensibility questions with the Extension Manager, VSIX, pkgdef files, moving extensions to VS 2010, SDK, or anything related to extending Visual Studio, you can post your questions at our Beta 1 Extensibility forum:

http://social.msdn.microsoft.com/Forums/en-US/vsxprerelease/threads

We will be monitoring the forum during the Beta 1 cycle and will try to respond to your questions, concerns, and comments as soon as possible.

-Quan