Google is well-known, almost notorious now, for pursuing/attacking anyone who uses their trademarked name. You can give it a shot... usually they'll start by sending a Cease & Desist order, which gives you a chance to either transfer the name over to them, or just drop anything you were doing development-wise.
If taking a chance it won't be found out, or fighting with 'the man' is your idea of fun, you can keep up with names like this; my domaining pard has a whole roster of xbox names (I don't touch them - just goes to show you it's an individual thing, you have to decide on your OWN ethics for these 'bad faith' registrations - bad faith refers to trying to profit off someone else's property)... but if you just want to get on with domaining and having fun and making a living, let go of trademarked names like they're grenades with the pins pulled.
I know they're suductive; I just invented xboxBlood.com a week back, and it's been knocking hard in my head, the only TM'd name I've ever considered reg'ing because it's just so damn cool. Hopefully someone will see it here, go nuts for it and reg it, and save me from my own temptation

In fact, I'm going to go now and add it to my 'available domains' list (see signature), ha.