Not a new concept

Yep.  I've used Linux-Vserver for many years now (in production environments), and it's
performed great.  It *is* a shame that nothing made it into the mainline kernel before recenet
times, but my impression was that neither of the major codebases (Vserver, OpenVZ) were
particularly merge-worthy..

I'd also like to second the recommendation for Debian/etch's Linux Vserver integration.  A few
minutes of download and a reboot and you're ready to go.