Imagine that you have a Skype meeting between colleagues scattered in different places, and then a topic appears where an image would be better in communicating the message than any word in the world. Especially if colleagues can then comment by drawing themselves in the picture or pointing to different parts to ask about things.
Just that scenario, Black Pixel developers developed the Pixelboard app for themselves but have now released it on the App Store.
Pixelboard is like a connected whiteboard that allows up to nine users to connect at the same time from which ipad. Everyone can draw, and if you just want to point, there's a special tool for the others to see what you're pointing to.
The app is free to test but to continue using the collaborative features after 14 days requires a buy-in app.