In December 2008, Microsoft surprised a lot of people by releasing an iPhone app — Seadragon Mobile. A month later, they ensured the move wasn’t taken as a joke or gimmick by launching another app, Tag, into Apple’s App Store. Now, they have a few, including an app for Bing. And starting today, they’re doing the same for Android.

Tag for Android is the first Microsoft-made app launched on the mobile platform. This is notable, of course, because Android is the mobile platform…