Portable Ubuntu Remix

There is a great option for the Operating Systems section: Ubuntu Portable remix. It uses co-linux to run within Windows without need for QEMU or anything like it and if the website is to be believed it is completely portable. It is a little heavyweight of course but it is a great way to take Linux with you when you travel and the single-executable structure (plus a filesystem file) makes it easy to wrap with a NSIS launcher so that it will integrate with the menu. I don't have a Windows machine so I know nothing about it except for its existence but it is certainly worth checking out: http://portableubuntu.demonccc.com.ar/
--Eric