On Amazon Building an Android App Store:
PaidContent nails it:
Amazon already has a huge billing platform, which has millions of credit cards on file around the world, much like iTunes. Android is the logical platform to experiment because it’s open and in need of third-party providers. Google has primarily integrated its own Checkout payment platform and credit-card billing in some countries. Developers are looking for another way to monetize.
Amazon could take advantage of developer’s frustrations with Android Marketplace’s shortcomings (lack of international support, piracy, and payment systems), build a foothold, and start selling their video and music content as well.
