I'm a big whiteboard user. Digital whiteboards are becoming popular...and I think it would be in line with the canvas technology. The only difference I would see is being able to not make it final. And make it so that anyone could erase anyone's work on a whiteboard. I think a digital whiteboard would be a great way for people to transfer information at a specific location.
Thusly, could you also push a button and uplink whatever is on the whiteboard to an eMemory module, or to a Node/Email account on the grid.