Go to
http://www.uspto.gov and look up those trademark ID numbers... when you find the docs, if they aqpplied before you bought the domiain you're basically out of luck.
If they applied AFTER you bought it, then call an attorney. You don't have to turn it over. Unless there is something that has changed since the last time I read a news article on this.
Its basically a first come first serve... so if you are in possession BEFROE they do a TM, then they are outta luck. But I'm pretty sure the TM stands from the application date, not the approval date.
Now for that help, I don't want to see another napster of porn spam, mmmK? ;-)