No. 1: The Kno
This beast features two color screens each measuring 14.1-inches diagonally and weighing a hefty 5.6 pounds. Perhaps acknowledging that the field of choices for tablets is quickly becoming crowded, its makers have designed The Kno for use in higher academia, and their business plan appropriately markets it to this audience.
They pitch their two-screen offering as a "digital textbook" which offers e-book versions of college textbooks at about half the price of their dead tree counterparts. The Kno itself, though, isn't cheap, starting at $899. (A single-screen version starts at $599.)
Each of its screens has a 1440-by-900 resolution and a multi-touch interface. A stylus is included, which you use like a pen to scribble words or doodle on one of the screens. The operating system is based on Ubuntu. It comes with only 512MB of RAM and a processor "up to 1.0 GHz." It gets online through Wi-Fi, but there's no version with 3G. And it lacks a camera.
Want one, regardless? You'll have to sign up and be put on a wait list to buy one. Its makers claim that "there are not enough to go around."