All of the things sister comment listed and more. * Compartmentalization * Layered defense * Windows is not allowed to touch my bare metal * Having developm

All of the things sister comment listed and more. * Compartmentalization * Layered defense * Windows is not allowed to touch my bare metal * Having development images for work, play, etc. * Easy migration * Configuring multiple separate environments from one control node * Accessing my virtual machines over the wire using QEMU on my laptops * Being able to take a system crash without losing other running contexts. * Maintaining host-level logical volume management and snapshots while guests retain a simplified partioning layout, with separate images for easy migration of `/home` and `/usr/local` * Advanced firewall configurations etc.