1) win xp runs under bochs now
that means that it probably won't be much harder to get it to run under real hardware..
2) net bsd if anyone feels adventurous they are welcome to test out NetBSD. If will either fully work just like OpenBSD does, or it will boot like FreeBSD all the way to exec('/sbin/init'); and then slow down to crawl.
it simply has not been tested so far. the same goes for hurd.
i don't think i'll have time look into either of those soon.