Barnes & Noble has launched its NOOK e-book reader for Android-based devices.  The bookselling giant’s app lets users browse for books from their smartphones wirelessly and download from more than one million e-books. Features include reading in landscape or portrait mode, text and font adjustment, and the ability to share e-books with friends for up to 14 days.

The NOOK app works on Android 1.6 devices or higher and is available now for free on the Android Market.