It's been more than a month since we last heard from Google regarding how many devices are on which version of the Android operating system, and what a difference a month makes. As of Aug. 2, only 4.5 percent of phones were on Android 2.2, aka Froyo. Fast forward to Sept. 1, and that number jumps to 28.7 percent. We have the Evo 4G, Droid and Droid Incredible updates to thank for that, mostly, plus the Nexus One and Droid 2. (It will be interesting to see how all of the Galaxy S phones affect these numbers, as they all launched with Android 2.1.)
The other "outdated" versions of Android continue to fall, with Android 2.1 down to 41.7 percent (from 59.7 percent), Donut down to 17.5 percent (from 20.3 percent) and Cupcake at an even 12 percent (down from 15.3 percent).
Now let's get the carriers to push out a few more updates and see how much Froyo can grow by October, shall we? [Android Developers Blog]