This does nothing on it's own and is a requirement for some of Tux2's plugins.
Per world inventories and health
Change those mob spawner types!
WeatherRestrictions
Runto the color selected before the floor falls out from below you!
Death chests for the masses!
Have more than one spawn point in your world!
Create Kits in game with enchantments!
Give away anything enchanted with anything!
ClayGen
Clone and Scale/Zoom Any In-game Map
Social graphs, chat logging, and messages made simple!
SmiteKick
Turn mobs into spawn eggs using splash potions
Fixes the current powered rails dupe exploit in Minecraft 1.1
SuCommand
ChunkScrubber
Exploding sponges!
Generate a handy report to hand to plugin authors.
Shorten those URLs!
Find out the history of a username!
Use a Twitter Feed as your announcements!