Someone recently released an API which allows you to change the nametag colour of a player. By the nametag, I mean the white name above the player's head. This would be a pretty cool perk, for donors for example. The API can be found here: http://dev.bukkit.org/server-mods/tag/
Spout, already done. EDIT: I should probably read the post before I post. LOL. What is this doing in the Plugin Requests section?