"Axiotron's ModBook: distributed by OWC, tollerated by Apple" as posted on Engadget.com by Paul Miller. To purchase see this link. It is apparently a slate since I see no pictures of a keyboard. It uses a WACOM digitizer. So now MAC users can join the mobile learning environment too.
Note / Update: It is not a slate, but a mac book with a Wacom screen attached. A hybrid of technology.