Every few weeks, Google’s Android team updates their Platform Versions page that breaks down how many Android devices are running each version of the OS, based on data from the official Android Market. Today’s it’s reached a big milestone: exactly 50% of Android phones are running 2.1, the latest officially released version of Android (2.2, or Froyo, went live for a small number of users last month, but has not officially been deployed on a wide scale).