Domain names and trademarks.If you're using someone's trademark in your domain name, you may be okay. Then again, you may not. There are three types of claims you might trigger:
What's going to happen to you? For the use you describe, we can't predict how Nintendo will react. Other sites have incorporated "wii" into their domains -- for example, Wii Chat and Wii Mommies -- and seem to be operating without a problem (although these sites don't directly compete with Nintendo or appear to sell Nintendo products.) At the same time, many other companies appear to permit the use of their marks in conjunction with domains selling products -- for example, Apple and Mac related sites. So, it's hard to tell (although our inclination is to avoid it.) If you do use Wii in your domain, you should disclaim any connection with Nintendo by prominently stating that the site is not affiliated with, endorsed by or associated with Nintendo. That won't prevent Nintendo from coming after you. But it could make your life easier if a dispute arises by showing your good faith attempt not to confuse consumers.
What's the worst that could happen? It's always hard to predict the worst that could happen. Arguably, if a claim is made, and Nintendo proves that you are likely to confuse consumers, a court could require you to pay all your profits and shut down the site. The Dear Rich Staff believes that if Nintendo learns of your use and is unhappy, the most likely result will be that Nintendo will ask you to shut down the site and hand over the domain name.