Windows 7 Beta (x86) : 7000.0.081212-1400_client_en-us_Ultimate-GB1CULXFRE_EN_DVD.ISO
Windows 7 Beta (x64) : 7000.0.081212-1400_client_en-us_Ultimate-GB1CULXFRE_EN_DVD.ISO
You'll still need to go back for a key, assuming you want to use the beta for more than 30 days, but at least you'll be able to burn a DVD or mount the ISO in your favorite virtualization app. Alternatively, there are plenty of timer reset and watermark removal tools available on the various torrent trackers.
[ via Sizzled Core ]