Look out, Amazon: Barnes & Noble's Android-based, dual-screen e-book reader made its own impressive debut today, wowing observers with both its features and its price.

Dubbed Nook, the $259 wireless e-reader is available for pre-sale today, with retail sales set for the end of November.

Similar to the popular Amazon (NASDAQ: AMZN) Kindle, which operates on Sprint's network, the Nook features 3G connectivity courtesy of AT&T. But it also supports Wi-Fi and, in addition to its main E-Ink reading screen, sports a second, tiny color touchscreen for navigation -- enhancements the single-screen Kindle lacks.

It also includes a feature that allows owners to lend their e-books to others. The "LendMe" tool lets users send e-books for free to a friend's Nook, iPhone, iPod Touch, PC and select BlackBerry and Motorola smartphones, for up to 14 days.

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