Arena Ignore 

Arena Ignore takes advantage of the fact that you can use /ignore to check who you're against, it works by recording all the enemies you face in arenas and then checking that list whenever you join an arena. 10 seconds after joining an arena we scan the list and then display who's in the same arena as you.

This will work for people from the same server as you, however you need to have some spots open in your ignore list (preferable per send * 2 free, or 10 slots by default).

Is this illegal? All this does is call AddIgnore and DelIgnore if Blizzard decides they don't want this it's dead simple and theres about 50 different ways they can prevent it.


NOTE: As of WoW 2.3.3 this has been offically broken so ignores no longer work while inside arenas and is mostly kept up for fun.