RemoteBukkit allows admins to, with the help of a plugin, remotely use the server's console.
DeathBukkit allows players items to be preserved after death, so that they can be recovered.
PluginBukkit allows admins to, with the help of a plugin, enable/disable plugins from the server's console.
LightLevel is a simple plugin which changes your exp bar level to the light level of your feet.
Get notified when the server is about to run out of memory, or opt to recieve periodic RAM usage information.
LibBukkit is simple plugin abstraction library which does the "dirty-work" for you.
ArmorLocker gives the player the ability to equip or dequip armor instantly, simply by right or left clicking on a "locker".
BlockBlocker is a very simple plugin which has the potential to radically alter gameplay.
EntityShield is a simple plugin which prevents players from damaging certain entities (configurable), acting as a shield.