I was just looking at shapr's diary entries regarding his Bicycle Repair Man project and it occurs to me that there should be another relationship type between people and projects: Commentor (or is that Commentator?)
The category would be for people who normally go in the "special thanks" section of a book. People who don't necessarily contribute code, but give lots of ideas and insight. I guess they would be contributors (since they contribute ideas), but my impression of contributor is contributing code.
All you people who read recent diary entries ... feel free to comment :-)