If you plan on not going ligit this is a good choice for the Mac to activate Windows 7 
It also works awesome on a PC.

<img src="http://i34.tinypic.com/k3vviq.png">

DOWNLOADS

New 1.7 http://www.mediafire.com/?gm1inwromyj

Source
http://forums.mydigitallife.info/showthread.php?t=8632

I tried this on a friends Mac today and it worked great. No long load up times like you get from other cracks/loaders. If you have a Mac and use one of those loaders to activate Vista or 7 you'll know what I'm talking about.