From Slashdot: Microsoft is giving away copies of Windows Vista Ultimate (32-bit or 64-bit DVD), Microsoft Office Ultimate 2007, Microsoft Money Plus Premium, Microsoft Student with Encarta Premium 2008, or Microsoft Streets and Trips 2008 — you can choose any one. The caveat is that you have to let them monitor your use of the program."

Who knows how long this is going to last.  If you've always wanted to get a legal copy of one of Microsoft's versions of Vista or Office 2007, sign up.  Just know that you will be required to let them know how you use the software and give your ideas for how to make it better.  They may also monitor how you use the software.

The way I look at it is that they already have the capability to "see" us using their software so you might as well get a free copy of their software for it.