Really great summary, I'll give it another read and edit for extra comments later.

My 1st thought is to concur totally that pvping with multiple classes is tricky to say the least. Haven't mentioned it b4 (as it was pretty embarassing) but even fully twinked, my team of feral druid, resto shaman and 2x affliction locks got thorougly pwned. PvP is too fast moving and with so little time to plan, and non synchronised spell casts, you will not last long.

I'd also perhaps rank shamans (if grouped 2+) as slightly higher ranged DPS potential. Given that so many of the abilities/totems can stack.

EDIT: I also thought it might be nice to link some example videos of popular combos in action, so people can get a flavour.

EDIT2: Although its only semi-related, I'd advise all players to make their main not only their tank, but their main gatherer (but explain about the skinning macro).