Dutch analytics firm, Distimo does nothing but study apps. At the recently concluded MWC, they gave a presentation on the 6 largest stores. Below, you will find a slideshow that details some of their findings. No surprise that the App Store is the largest with over 150,000 choices while the Android Market comes in second with 20,000 apps. The latter has increased the number of downloads every month since opening. From a smaller base than the Apple store, Android is actually growing faster on a percentage basis. ReadWriteWeb points out that Android Market is the fastest growing of all app stores. The Android Market also has the largest percentage of free apps (57%) quite possibly due to the open source nature of the Android OS.