I honestly don't remember what I was looking for today when I came across Double Driver, but I don't think it was anything as cool as what I found.
Double driver is for Windows systems, and when you run it, it scans the system to find all the used drivers. It then gives you the ability to backup those drivers (maybe to a network drive or flash media, for instance).
I installed it and checked it out, and I now have a flash drive that contains all the drivers that I'd otherwise have to hunt for and find if I need to reinstall my Vista machine. It's a very handy application, and if you know you're going to be reinstalling (or even if you don't, it doesn't hurt to be safe), you might want to check it out.