From the ModBook website:
Designed in California by Axiotron’s team of German and American engineers, the ModBook™ is at its core an after-market hardware modification to standard off-the-shelf Apple® MacBook™ systems, converting them into high-end slate-style tablet computers. With its condensed form factor and integrated pen-based user experience the Axiotron ModBook is the ultimate companion for applications and situations where a keyboard only gets in the way.
Built for mobile users, artists, students and professionals, the ModBook enables its user to draw and write directly on the screen, while the handwriting recognition built into Mac OS® X Tiger not only turns hand scribbles into text in every application, but also provides extended control of the system through gesture recognition. The ModBook comes standard with a built-in iSight™ camera and an integrated CD/DVD combo drive that can be upgraded to a 8.5 GB DVD burner, and it is the only portable Mac solution that also features an optional built-in Global Positioning System (GPS).