Bukkit

Revised command system.
Group join and quit messages.
/online and /maxonline variables.
API to add in more variables.
FirstJoin messages.
Ability to enable and disable messages per player, group, and global.
Example user and group in config.yml.
CustomMessages.firstjoin, CustomMessages.join.group, and CustomMessages.quit.group permissions added.
Added in config option to display messages in console. (config.show-messages-in-console)
Added in config option to show errors generated by custom message variables. (config.debug)

MessageVariable class is rewritten from 2.2-Beta-1, method signature changed to:
public String getReplacement(Player, MessageTypes)