widgets, whiteboard, --> interesting!!.

Actually I was looking to build a collab whiteboard app myself some time ago, but then I decided to focus only on one, the one I am currently building. I explored what is out there at that point of time and I found quite a few, a few good one's will be http://www.jotspace.com/, http://www.instructure.com/ [not a whiteboard, more of other collab features], http://etherpad.com/. Check them out. That interest was the reason why went ahead and explored it. The UI is prototypical, needs a lot of work.

I will play with it sometime when I get time.

Keep up the good work.