I have not used it. You might want to keep an eye on Qemu though. It will run as a host on x86 platforms (currently being ported to Windows) and ppc. It will emulate x86 and (soon) ppc architecutes (others are on the way too). Supposedly you can run Windows in Linux using Qemu. Again, this isn't something I have done myself (cause I haven't had a need yet), but it looks cool and I may give it a try sometime.

Here's the Quemu url: http://fabrice.bellard.free.fr/qemu/

BTW, you can apt-get qemu. Make sure you read the documentation very carefully though. I hope it works better than bochs. I got Windows running under Linux in Bochs, but it was HORRIBLY slow.