Was wandering around www.instructables.com following a link in a JC thread, and found:
EDIT: Main Website
The pictures look awesome, and with 3 spokes set up with boards, you get a static image at 7mph… well within unicycling speeds. You can program any bitmap image to be shown, with animation. Includes step by step instructions on how to make the system for yourself, if you have basic soldering skills, and a kit bought from a website.
Loose.