I would like to see an addon that displays a list of the players that your guild hates the most. I am thinking that it would be the members of the opposing faction on your server that kill your guild members the most. Maybe with an added option to manually enter names that deserve to be on the list.

Feel free to elaborate. I wouldn't think that it would take much to make. Unless you try to make it very scientific by making calculations based on how many times you have been killed by them, how many times you have killed them, how many times you have been killed by people in his guild, what color his eyes are, if he is right/left handed, etc.