I used to dual boot Ubuntu with Windows years ago. Nowadays though most of my computer use is on my work computer from home which has windows. So what I do is run a linux live boot of xubuntu on my work computer for personal use and use hard drives connected via usb. I've written bash scripts which auto configure it the way I want it during each live session. This way I don't have to worry about f'ing-up anything in windows and I don't get a call from the IT department the next day. The one down side of running xubuntu live though is that it doesn't come with nvidia drivers pre-loaded. The only linux distro I could find that has nvidia drivers pre-loaded to run on a live usb is PCLinux. PCLinux has a sweet looking KDE setup, but it uses RPM packages and is not really heavily supported so that's its downside. If I could just get a debian based distro with nvidia drivers pre-loaded it would be the perfect setup for me, but haven't had any luck finding one... arggghh!