Bukkit

MySQL-based banning for easy server administration

iPvp

Its Just a Dustbin :P

EasyHeal - The easiest way to heal yourself

OneForAll

Linx is a plugin to link your players to your servers website, etc with typing only one command for each!

Ever want to troll your guests just for fun? Blow them up! Strike them with lightning!

Allows staff on a server to incarcerate naughty players for questioning.

Bulletin board

ServerPanel will be a plugin/client pair which allows you to manage your server without the need to be in-game.

On demand player information

SQLite-based Permissions

SimpleWarn

Let your players shout across the server!

WWW CMS (Content Management System)

Creepah Craft Clear Chat

A list of players you would like to watch. Simply add and remove them from your list.

CopyDatBook

ForumAuth

Whitelist or Blacklist blocks per world.