Napkin is a very nice little Extension for Google Wave, allowing Wave users to work on and share simple sketches. This is very very far from a full featured image editor, much more suited for doing a quick sketch to explain or highlight a concept. All the parties in the wave can edit and view the “napkin”.
Using it is simple, just edit the blip it is in, and click and drag in the window to draw. There aren’t too many controls to confuse things, just the color and thickness selectors, and an undo button if you make a mistake.
Overall, Napkin is a gadget that has many uses, mainly in discussing ideas, and in communicating things which are better represented visually. I would love to see a game of charades on wave using it!
My only objection is the fact that there is no eraser function.
If you want to know more, you can check out the Project Site.
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