Google has released the numbers for the different platform versions accessing the Android Market ending Aug. 1, and there are no big surprises. Froyo still leads the pack with over 55 percent of devices running it, down about 10 percentage points because we're seeing a jump in devices running Android 2.3.3 or 2.3.4. The full breakdown is in the chart above, but if we take a quick comparison to the last time we looked at numbers, we see Android 1.5 shrinking by 0.4 percentage points, Android 1.6 dropping a half-percentage point, Eclair dropping a whopping 6 percentage points, and Honeycomb being split up into three versions for 1.3 percent total, up a full percentage point.
In simpler terms, like the ones used for other mobile operating systems, only 3.3 percent of all Android phones are not running version 2.x of the OS. In more realistic terms, well outside of any reality distortion machinery, 18.3 percent of Android phones can't run applications designed for all devices. It's a number that's slowly improving, and we hope to see the trend continue.
Source: Android Developer