Just wanted to agree with Brett here. While I think people try to be helpful on these boards, it is very difficult, if not impossible to get any serious and complete answer without a lot more details that really shouldn't be posted in a public forum. Plus, any advice received here really should not be relied upon because posters don't have what they need to fully understand the matter.
Definitely get in touch with a domain/trademark attorney. There are many on this board, or find someone locally, or whatever you prefer.
Eric
http://www.cyberlawonline.com