A cool blog from a transit geek in Portland: Trimetiquette. Apparently, bus fouls are a problem there, too, since (as the name suggests) this person spends a good deal of time educating folks about proper transit etiquette.
I still think there’s a market for an advice column–a Dear Prudie devoted entirely to transit. Shoot–send me some questions, and I’ll start it up. I (sort of) already have.