me just playing around with Portable Ubuntu not the one you would think either
it uses colinux
Updated: July 3rd 2013 with a link that does work!

Original Product page:

Note: its funny to think I was doing inception before it was cool, leo would be proud :P,
also its CO-linux not cool-linux my fault for leaveing that mistake up there for ~5yrs lol
another note: this will not work on 64bit..just found that out 🙁