The Windows 7 Beta, which was supposed to get public in mid-January has been leaked and you can get a copy of it on BitTorrent.

The 7 Beta is more stable than other versions we have been using for a few months. It is said that the new Bets is a kind of code that users could roll out and live with. All the previous Betas were solid, but this one is complete. It is also written that Beta will expire on July 1, 2009. You can get a copy of the new version by searching on internet, although you are technically not supposed to grab a copy till now.