Portable Windows
I just joined the forum so I could post this link as it might interest quite a few of you.
http://www.tomshardware.com/2005/09/09/windows_in_your_pocket/index.html
Essentially it's a guide to installing windows on a usb flash drive with the intent of it working like a live CD. There are loads of obvious uses for this, like fixing a computer that won't boot, or even running windows on a computer with no hard drive in it. Just thought it might be interesting!