Below is a list of Bukkit plugins created by me, Joshua aka Skriglitz
 

GroupBlacklist:

GroupBlacklist allows you to blacklist blocks and items per permission group using 3 events: On Block Break, On Block Placement, and On Item Use. This is great for keeping players from specific groups from using certain items and is perfect for a Role Server.

BukkitDev Link: http://dev.bukkit.org/server-mods/groupblacklist/

 

NoFlyPvp:

NoFlyPvp not only blocks players with flying enabled from attacking other players without flying, but can  also block that player from using bows and potions giving an unfair advantage! Another feature is that if a player has flying on they are required to turn fly off to attack back or optionally their opponent can enable fly to have a fair fight while flying!

BukkitDev Link: http://dev.bukkit.org/server-mods/noflypvp/