Plugins

What kind of plugins do you think minecraft needs? not plugins that already exist but plugins that should help improve minecraft (bukkit)...Things like essentials for example, even though its aready made i think that it should be improved and cause less lag to a server. Anybody else have any ideas for some really cool plugins??? if your making your own plugin and i like it i may even put it on my server (24.196.141.66). Comment any cool plugins you have ran into o rwant to see :-)