This is pretty awesome! Very usable, not too many features but the ones you really need and they work really well. I can totally see this maximized on a virtual whiteboard too.

It would be pretty cool to have access to apps like this for integration with 3rd party sites. Even if they left the original site and went to yours but saved back to where they came from, that would be very useful. I know www.snipshot.com does exactly that for image editing and it works well. Perhaps that could be a paid service idea... :)