You'll most likely lose the domain. It's not likely that you'll be recieving any traffic to a .tm domain, is it? So what's the point of registering it?
The domain as a brand is quite fantastic, i imagine you would get lots of traffic if you advertise it as MySpace<sup>TM</sup> (yes i know HTML is disabled), but then again, you cannot advertise it as MySpace<sup>TM</sup> A.H
Bad reg, sorry. It is probably worth only low $xxx. If myspace files a dispute, consider it sold to myspace.com for $0 imho. Rob