And the answer is... Solaris! (Score 0)

OS/X Spaces are like Solaris Zones. Think of it like a virtual computer... OS/X Time Machine is just a point-in-time copy of the filesystem. Sorta like EMC's BCV's (Business Continuance Volumes). Of course if you'd like stuff like this now and don't really feel like waiting for it, you could just load Solaris on your Intel-based Mac! Been done, and works just fine.