Even though Apple is taking them to court over the “App Store” naming, Amazon’s Android app store is now live.  Their first free app of the day is Angry Birds Rio and you can get a free copy by visiting the store today. After the free promo is will be $.99 for Angry Birds Rio.

They are launching with roughly 3,800 apps in their catalog and a whole new system for buying and trying apps out. Test Drive as Amazon calls it enables some apps to be tested right from within your browser and offering full screen previews of app you may want to purchase. The Amazon Android app store is easy to navigate and you should give it a try. [Amazon app store]

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