I'll try to write something up tomorrow and probably put it in CVS as well as post it here.
Celtk is a good Cells demo since it makes extensive use of the new client queue of deferred propagation tasks, as necessitated by Tk. Maybe someday it will be its own c-l.net project, but for now it is just a second module under in the Cells repository (well, there are others but they are deprecated.)
kt