Thanks to the article on this site, the PumaPaint has seen a manyfold increase in activity lately. One readily apparent problem is that only one user can be painting at a time, so this site can be swamped easily.
Any number of users can watch the action by starting up the camera applet, but it only accepts one connection at a time. I have a student working on improving traffic management. Right now it is very poor, you can connect and the interface will say you are connected, but you are not really in control. What is happening is that your commands are being queued in the socket, and this is a pretty stupid feature.