I took a few hours this evening to whip up a tool for Phun users. For those you you that haven't tried Phun yet, it's a sandbox physics simulator/game written by Emil Ernerfeldt for his Masters thesis.

The tool overcomes a few of Phun's shortcomings, namely the ability to draw straight lines and complex symmetric shapes, and is called the Phun Gear Creator.

Check it out here:
http://www.codebot.org/articles/?doc=9516