World of Warcraft PvP Honor Guide

Blizzard's official World of Warcraft community website has been updated with a new PvP guide, which offers in-depth information about the game's Honor system. Here's a bit of what to expect:
Dishonorable Kills

Killing an NPC labeled as a "civilian" is considered a Dishonorable Kill. The civilian label appears on NPCs such as vendors and quest givers when your level substantially exceeds theirs. Beware: penalties for dishonorable kills are applied immediately and may cost you Ranks outside of the weekly Rank calculations.