MSDN Subscribers: Download the Beta
The Visual Studio 2010 and .NET Framework Beta 2 is available to MSDN subscribers now, with general availability on October 21st (22nd in Australia).
This c9 video is a great way to get started 10-4 Episode 33: Downloading and Installing Visual Studio 2010 Beta 2
Also check out the list of what is new in beta 2 here http://msdn.microsoft.com/en-us/library/bb385832(VS.100).aspx
Have fun and let us know what you think via the connect site https://connect.microsoft.com/VisualStudio/content/content.aspx?ContentID=14625