There is a fairly interesting little file rolling around the Interwebs which creates and tries thousands of Vista keys based on a single product key without Vista getting wise to your antics.
The program takes your install key and creates a bunch of activation keys. It then “tries” them and may or may not activate your copy over the course of a few hours — or, ominously, days.
I couldn’t find the file but it’s out there somewhere and, if this screen cap from the source is any indication, you may need a girlfriend instead of Vista.
Vista Brute Force Keygen [Keznews]