A milestone announcement today for HBO’s streaming platform. The new HBO GO app, available at the Amazon Appstore for Android, should significantly expand the number of HBO subscribers who’ll be able to use a mobile device to watch the premium channel’s 1,400 titles including original series such as The Sopranos, Sex And The City, and True Blood. It also suggests that it won’t be long before HBO GO will be ready for other Android tablets. Most cable systems make the service available on the iPad, iPhone, Android phones, Roku, Samsung smart TVs, and the XBox 360. “Kindle Fire owners already download and use apps and games frequently on their devices, and we expect that only to increase with the addition of HBO GO and all of its popular content.” says Aaron Rubenson, Director of the Amazon Appstore. Amazon boasts that the Kindle Fire is its most successful product launch. But the company has disclosed little hard sales data. Meanwhile Amazon’s recovering from a slap this week by ABI Research. The firm says that the Kindle Fire slipped to third place in Q1 tablet shipments. Apple’s iPad accounted for 65% of the 18.2M shipments, while Samsung moved into second place with 1.1M.