That is a GREAT idea,
I used to have two shared machines at my house that only booted from a zip drive and gave everyone their on zip disk with their own environment and it was great as you would just whip it in and do your thing. Then when you moved in the house you took your environment with you.
But the idea of just walking up to some odd machine, pluggin in a usb keychain and booting up to your environment would be equally cool and allow access to a great many more machines.
Let us know how it works out.
-Alex
