there is a site called smashmyxbox, i guess if msft was touchy about trademark issues they would definitely be after these guys
i know apple let a bunch of sites with "pod" in them go on for years and then suddenly brought the hammer down
hard to know whether msft will crack down
i just regged psxbx which i think will withstand scrutiny but obviously won't get any search hits, it's a development site only i think
what do you intend to do with it, i think you would get quite a few hits with the name and do a nice mini-site
but i wonder who would buy it with the tm issue hanging over it ?