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Both the TouchPad and the app are scheduled to debut this summer, though neither Amazon nor HP have named a specific date.
The apps will allow users to purchase and read Kindle books on both kinds of tablets, automatically syncing with apps on their other devices, including desktops (Mac, PC and web), smartphones (iPhone, Android, BlackBerry and Windows 7), iPod touches and iPads. It's all part of Amazon's strategy to make the Kindle Store available on as many devices as possible.