Ah, yes, the old Airpanels. I looked at them at the time they first came out, but they seemed to be just a monitor echo device, with "pen" control of the mouse, so not nearly useful enough to justify the $1k original pricing for me.
I didn't realize they were WinCE machines however, so this may be a later incarnation than what I looked at.
I'll be interested to see what you make of it, Nate.