I love it - works perfectly... but immediately the feature creeper in me has kicked in. Killer features 1. Be able to type in text (any font will do) 2. Drag-and-drop an image to be be able to annotate it over the top (would be excellent design task, e.g. using screenshots of some work-in-progress). 3. Movable objects?
I fully agree, especially for the text (it is hard to write with a mouse!). In addition, basic shapes like line/rectangle/circle would be welcomed (I am terrible at drawing a circle with a mouse).
He did the product with tablet users in mind.