TechNet and MSDN Subscribers can now download the Windows 7 Beta release. At PDC, you have seen the M3 Build in action.

The Windows 7 Beta relesae is the build 7000 available for both x86 and x64 bit platforms.

For more info visit windows team blog: http://windowsteamblog.com/blogs/windows7/archive/2009/01/07/information-on-downloading-and-installing-windows-7-beta.aspx