blXP Mobcatcher and Bookrules All great and useful plugins

blXP: http://forums.bukkit.org/threads/fun-blxp-0-2-7-sign-xp-banks-send-xp-to-player-1-3-1-1-2-5-r5-0.82180/
This plugin allows players to use Xp banks and transfer Xp to other players if wanted

MobCatcher: http://forums.bukkit.org/threads/fun-mech-mobcatcher-v2-18-1-capture-mobs-and-get-spawn-eggs-legitimately-1-3-1-r0-1.57638/
This plugin allows players to catch mobs of all types with eggs and redstone making a great source of trading and makes it easier to catch mobs

Bookrules: http://forums.bukkit.org/threads/fun-sec-bookrules-v1-0-read-the-rules-from-a-book-1-3-1-r1-0.92115/
This plugin allows staff to edit the rules at will and gives books a great use the book will be given at the command of /rules