virtualbox

holy grail: windows 7 and ubuntu dual boot, with either also running under a vm in the other. i've been looking around for a good virtual machine; some of the old ones seem kinda dead or just emulate (read: way too slow) (bochs, plex86) or are too slow except on linux host or maybe forked off somewhere else (qemu/kqemu or whatever). xen looks pretty good, especially with its capability to run a guest os off a partition. but it only runs on a linux host, so that's only half the answer, and i'm not sure if anyone has gotten it to use an existing windows install. virtual box can run on windows or linux host, and it can run either guest at virtualized native speed. and maybe i can get it to run an existing windows or ubuntu from the other. one problem with booting the oem windows partition is that setting up virtualbox from linux will require bootrec.exe from an install (not recovery) dvd. (colinux might be able to boot an existing install, but colinux is limited to one processor atm.)