[nickconfer]

I'd go this route. It will help you out the thief, get you some links from any added press, and possibly even help market your company further.

Lawyers are expensive and you could battle someone for a very long time. Is that really what you want to do starting out the gate? You'll get too distracted by this, focus on your company. At the end of the day people type .com in first and if you have the links, your domain will show up first in the search results as well.

[jhubert]

Agreed about Lawyers. I am happy to spend money on them as necessary for the right things, but this seems like something that could be very lengthly if not approached the right way... and one thing I know about hiring lawyers is that long problems have big bills. :p