Android is definitely promising and already holds significant market share among the mobile operating systems. However, the bigger concern is the fragmentation of the platform into various versions. Here is the percent of mobile devices using the various android platform versions

Android 1.1 : 0.3%
Android 1.5 : 27.7%
Android 1.6 : 54.2%
Android 2.0 : 2.9%
Android 2.0.1 : 14.8%

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