Here's another one on a different realm. I especially like how some instructions are clearer than others (one of the instructions says to just kill a member of a certain guild), though it's not really fair to put just one guy in the center. Then again, maybe he wants to be there-- would you enjoy having a big price on your head, and players gunning to empty your health meter? Zerging groups are apparently acceptable, and though tracking via friends or alts is allowed, I'd think that would be a gamebreaker. Apparently switching to alts is acceptable, too-- all the kills don't have to be done with the same character.
This kind of thing almost makes me wish I played on a PvP server, although I'm sure the same thing could be accomplished via duels. Fun idea, and definitely should make for some good world PvP. Makes me wonder, too, if Blizzard would ever consider player-created bounties ingame-- while there's probably a lot of potential for griefing, players who consented to it would probably have a lot of fun.