Somebody has registered a domain name that is the same as a trademark I own. What can I do?
First, talk to a lawyer! Second, don't expect that you automatically have the rights to that name.
The issue is a very grey area at the moment. DON'T fire off angry letters to the owner threatening all manner of retribution unless they hand over the name. Get legal advice instead. One more thing: InterNIC has a procedure for filing complaints. Use it.