I think an awesome plug in would be a simple head drop of a player that dies. This would give people even more excitement to collect the heads of other pvpers to put on display like a trophy. I know I would sure like to put a plug in like this on my server
Well first, it isn't as simple as it sounds (isn't hard though). Second, someone made this BEFORE 1.4 even came out Think it is called "Player Heads" or something.
There are many plugins that do exactly this. dev.bukkit.org and search there http://dev.bukkit.org/server-mods/player-heads/ link just because