"Well, at least a free test copy of Windows 7, anyway. Users have until Thursday to download the 'release candidate' version of the software--the final test version of the operating system. It's a good option for those who have a spare machine to try out the software or for Mac users looking to experiment with running Windows either in virtualization software or via Boot Camp."
You can still get a free copy of Windows 7 RC1 It is good until about March of next year.
you need to get a copy by Thursday or you can't play with Windows 7.