The somewhat controversial .mobi top-level domain name is officially open for business today but, as we reported earlier this year, it's not exactly open to everyone (yet). As of today, only trademark holders in the mobile industry are able to register domains. They'll have until June 12th to secure their name, at which point the domain will be open to any trademark holder -- everyone else has to wait until August 28th. We'll just have to wait and see if the domain flies or goes the way of .biz.