Its called a UDRP, costing around 1 or 2 thousand dollars and takes some time to get. Its also dependant on various factors like whether theyre using the domain in bad faith. If you happen to own the trademark of the exact name that their domain uses, excluding the .com of course, you have a very strong chance of winning the domain. Here's the general info on a UDRP http://en.wikipedia.org/wiki/Uniform_Domain-Name_Dispute-Res...
And here is a domain name attorney which I highly recommend and who can solve all of your domain related inquiries: http://www.wileyrein.com/professionals.cfm?sp=bio&id=111...