Scribbles is a simple drawing application for mac. Since over 30% of our visitors use mac, we thought it would be worth sharing some of the tools we find really useful. Its made by atebits who also make a great tweeter (twitter client) for iphones (still trying to win one).
Easy drawing
Heaps of colours, or sample one from somewhere else.
Add or remove a layer
We find it useful for getting those ideas out quick. Its like a pen and paper with some extra bits and great if you like a paper free desk!