Windows 7 Beta 1 Build 7000 MSDN ISO DVD Download
Windows 7 Build 7000 Beta 1 MSDN ISO DVD Release
It appears that there is not much changes from the leaked Windows 7 pre-beta build 6956, although there may be under-the-hook changes and tweaks invisible to ordinary users.
The only clue that Windows 7 build 7000 is indeed a beta comes from About dialog of Windows Media Center, where the Windows 7 has the version build 6.1.7000.0 (winmain.win7beta.081212-1400). The build will expire on 02.07.2009.
Download : Windows 7 Beta 1 torrent