Is there an explanation somewhere of what a moderator, coordinator and other staff do? I ask out of curiosity, because I can't devote more time to the site.

I did find a "Who's who" list under "About us" -> "Renderosity Team" (although I don't get the point of the "Forums" column versus the "Forum Moderators" picture area -- if one is a quick link for the other then they're out of synch, because they show different people).