Whenever you download an app from an app market, certain details about you and your device are exchanged with the company from whom you've downloaded the application. One of those details is what version of Google's popular operating system you're using when you download that application.
Google today released some of those details to the public. The newest version of Android, Honeycomb, has garnered only 0.2%, while the most previous version has 1%. The biggest share of Android belongs to Froyo, which has a whopping 61.3%.
To me, Android fragmentation is a serious problem that's only reiterated here with this chart. A lot of people are either left behind from being on an old release, or too far ahead and not having any apps developed for them. Google needs to figure out that this is a serious problem for all of its users, and one that will surely only get bigger with time.[Android Central]