Amazon has opened the Appstore forAndroid, providing another option forapp shopping to U.S. users of smartphones with Google's operating system. Posted on Tuesday Mar 22, 2011 6:10AM by Mikael Ricknäs Amazon has opened the Appstore for Android , providing another option for app shopping to U.S. users of smartphones with Google's operating system. Amazon is trying to lure users away from Google's Market by offering users a free paid app every day. The first such application is Angry Birds Rio, which usually costs US$0.99, and is an exclusive for Android users via Amazon's store. Users can also test applications with a feature called"Test Drive," which runs applications on a simulated smartphone. Amazon will also have an approval process for applications submitted to its store. The company will be testingapps to verify that they work as outlined in the product description and to make sure hat they don't impair the functionality of the smartphone or put customer data at risk once installed.