NextBook ereaders and tablets are all based on the Android platform and are made by a company called E-FUN, whom also make a pen that can digitize any written text.
There are currently two NextBook devices on the market, the Next3 and Next2. The newer models, the Next4, Next5, and Next6 are expected to be released in April-May 2011. All support Adobe DRM and tie-in directly with the Borders ebook store, although you can buy ebooks from just about anywhere using apps.

The NextBook Next6 is a 7" ebook reader tablet hybrid that runs Android 2.1. It comes with ebook apps built-in and can install many more.
It is essentially an updated version of the Next2, adding a capacitive touchscreen, more memory, and a more polished design.

The Next3 has an 8.4" resistive touchscreen with a pixel resolution of 800 x 600. It runs Android 2.1 and is open to installing Android apps.
The Next3 has WiFi for browsing the web, if can play videos and music, send and receive emails, play games, and everything else you'd expect from an Android-powered tablet.

The Next 2 is Nextbook's most inexpensive reader. It has a 7" resistive touchscreen with a 16:9 ratio and 800 x 480 pixel resolution.
The Next2 runs Android 1.5, an earlier version that isn't compatible with a lot of newer apps, so this device is more suited to e-reading than installing and experimenting with a bunch of different kinds of applications.
Next2 Reviews at Amazon »

The Next4 is E-FUN's premium tablet. It has a 10" capacitive touchscreen with a pixel resolution of 1024 x 768.
The Next4 comes with 8GB of built-in flash memory and runs Android 2.2 for full Adobe Flash support and the ability to save apps to the SD card.
The NextBook Next4 is expected to become available in early Q2 for a suggested retail price of $349.

The Next5 is unique in that it incorporates E-FUN's patented digital APEN writing tool that allows users to create real-time annotations on documents, photos, add electronic signatures, create handwritten emails, etc.
The Next5 has a 7" touchscreen, comes with 2GB of memory, SD card slot, g-sensor, speakers, mic, and runs Android 2.1.
It is expected to be released in early Q2 for a suggested retail price of $279.
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