I put up a wiki page today with some stuff I wrote up on the bus this morning:
It's the first iteration, but I thought it would be a good way to start codifying what we want in terms of contributions. I have been following some discussions on other lists, where people are talking about contributions, and the relative impact of guidelines on the quality and quantity of contributions; with a release coming up (1.5, maybe May? maybe in conjunction with the Barn?) that I think will turn yt from a plotting tool into a full-fledged analysis and visualization solution, I thought we should start soliciting and encouraging contributions and bug fixes. These would also be great guidelines for us to follow as well; I am guilty of not realizing these ideals quite as well as I should, so now I can be publicly shamed. :)
I think you all have wiki accounts, so if I've left something out you should feel free to fix it up.