Yes – this information is from Google. They’re basing it on information gathered from the Android Market. But considering it’s from the horse’s mouth, take it as you would take Apple’s iPhone sales numbers. As you can see above, 50% of users now use Android 2.1, with the other half mostly divided between Android 1.5 and 1.6. Other market share studies from places like AdMob (that aren’t that old) recently showed that Android 2.1, 1.6 and 1.5 all shared a third of Android users. Is Android 2.1 rapidly gaining market share? Remember that the Motorola Droid – the most popular Android device in the US – was recently given Android 2.1, so that could account for the big migration towards Android 2.1.