Here is the information on the XNA team blog about how to participate in the beta and send feedback. 

http://blogs.msdn.com/xna/archive/2006/08/30/731941.aspx

 

 

There is also a more detailed article describing the XNA Framework.

http://blogs.msdn.com/xna/archive/2006/08/25/724607.aspx

 

Have fun writing games!

 

Scott.

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