Has anyone messed with this at all? It's nothing fancy, but it's still slick.
You use a really simple interface of color selection/opacity/brush size (no wacom pressure support though) and you paint in the flash interface. Facebook saves the cache out while you paint, so when you're done the painting is available for everyone to see in the form of a replay video.
http://apps.facebook.com/graffitiwall/index.php
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