Every so often, it's interesting to look at the breakdown of Android OS distribution, and today it looks like version 2.1 is gaining some real ground. As of June 16th, Android 2.1 accounts for exactly half of the devices used to access the Android Market, with version 1.6 at 25 percent and 1.5 at 24.6 percent. As Motorola rolls out updates to its devices running MOTOBLUR, we should see Android 2.1 gain even more of that pie. It's great to see so many devices using a recent version of Android, but the fact still remains that half of Android devices are using an outdated OS. As manufacturers skin Android and delay the update process for their devices, the OS distribution will remain fragmented. The fragmentation levels will just vary from time to time. The good news is that updates to the Android OS should begin to slow soon, meaning devices will not be almost a full 1.x release behind the most recent version of the OS like some are now. If you have an Android device, which version of the OS are you using?