Since the dawn of Microsoft, the main problem has always been piracy of Windows and other Microsoft software. Window 7 anti piracy effort has recently been busted by more intelligent software crackers.
And yes buddies, about 3 months prior to the official launch, a chinese forum has already posted a crack for Window 7 Ultimate and hence busting the ultimate marketing plan of Microsoft! An OEM DVD which has been leaked can be found at this chinese forum.
Will you too be going for it? Before you click the link do know that software piracy as any piracy is illegal. Lol I am saying this as if no one know it already. 
You can try the above crack released but also note that while the above activation crack has work for many Windows 7 users, there are some who also got their PC to the IT Doctor! So get it and use at your own risk of making a khebab with your PC.
If you have click the forum link above to visit the site, unless you understand Chinese you would see only alien characters there. So here is the Google Translate to English link if you wish to have a look.