I like the Ubuntu approach. Values and perhaps a code of conduct at a later date if we feel it is needed.
Massimo did a good job of summarizing the Web2py values and the three examples Bruno gave are a great place to start. I like the Ubuntu example because it is short, sweet and to the point and leaves no one out: "The Ubuntu project welcomes and encourages participation by everyone. We are committed to being a community that everyone feels good about joining. Although we may not be able to satisfy everyone, we will always work to treat everyone well."
