Battle.net Mobile Authenticator now available for Windows 7 Phones
Android and iOS device users have had the luxury of using the Battle.net Mobile Authenticator, a software version of Blizzard's downright necessary keyfob authenticator, on their phones or tablets for a while now. As of today, Windows 7 Phone users can also take advantage of the Mobile Authenticator by downloading it from the Windows Phone Marketplace.
At this point, there's pretty much no reason not to have an authenticator -- they're 6 bucks and free to ship for a physical device and no cost at all for a software version available for every major mobile platform. Just get it!