Great thread - I just joined the forum a couple days ago, but I've been commuting for a while now - around 1300 miles so far.
Best advice I can give is that you, as that lone cyclist, represent all of us in your interactions with the cagers - do right by me, and I'll do right by you - be calm, reasonable, courteous, and respectful. know your rights, and require that they are granted. Most of all, arrive alive -