There’s at least three versions of the Android operating system that have a significant number of users, meaning that developers will likely develop and test for more than just one.

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Increased fragmentation of Google’s mobile OS has been a concern, and now, Google (NSDQ: GOOG) is releasing figures to help developers make decisions on which versions they should support, and which ones aren’t worth it. While fragmentation will likely still be a concern, especially for those worried about speed to market, and the cost of support, it’s smart that Google is being as open as possible about the breakdown. In a blog post today, titled “knowing is half the battle,” Google says that most devices, or 54.2 percent, are running on Android 1.6. The second-largest userbase is using Android 1.5 at 27.7 percent. Meanwhile, 1.1 and 2.0 are running 0.3 percent and 2.9 percent respectively.