Okay, these are what I know so far... - Deep Freeze: nonfree, a bit expensive in fact. Supposed to be very good though. - Returnil: The only one I've used so far. Nice but has no persistance across reboots. - MS Steady State: apparently persistant across reboots. Not sure how secure it is though, given that it's MS software I'm a bit... Suspicious. Supposed to be persistant through reboot IIRC. - iCore Virtual Accounts: Looks pretty cool. Incompatible with Vista though. Not sure how good it is for security stuff (anyone know?). - Powershadow: nonfree. Looks like it's designed more along the lines of Returnil, specifically for security. May be dead? Are there any others out there or is that it?