Virtual machine dev env features

easy ability to ssh rc to it
sync directories (maybe even without reload)
os state easily manipulable (perhaps as file)
default of a few gigs of ram, the latest debian image, no gui
launch and connect in 1 command (vagrant-ssh does this for vagrant)
new vm in 1 command
nice-to-have: ability to diff filesystem, restore to checkpoint
nice-to-have: shutdown on logout