Rated Battleground Teams
WoW Cataclysm introduces rated battlegrounds and battleground teams. Since this guide is primarily about the battlegrounds themselves, and because the rules are evolving, I won't cover them here. But there are already some good sources of information ... here are some links:
Official World of Warcraft Rated Battlegrounds FAQ
Rated battlegrounds - WoWWiki
Rated Battlegrounds Guide - WOWGUIDE101