big time TM issue, the NFL have a no tolerance policy on using the word "Superbowl", I worked for a sports memorabilia company and you're forced to pay a hefty licensing fee even for using it in editorial copy.
I used to own superbowlaz.com (the official site of this year's Super Bowl), but let it lapse. I've always regretted that, but maybe it was a good thing? Oh well...