Received a gift of a Sandisk 4 gig thumb drive for some computer work.
I have played around with virtual hard drives/ MS virtual PC 2007 so I copied/pasted a folder containing a slimmed down XP Pro 2 gig vhd to the thumb drive and assigned a new vm to it and it's working fine.
So in effect I have my own sorta like "Mojopak" that I can run off any pc that has a vm player installed.
Things aren't as quick as running from the hard drive but is quite usable and am posting from within XP running on the usb atm.