Bukkit

v1.4.7a:

• AuthMe: Hooking Inventory-Store/Restore with given Events (requires 2.7.1+)
  • The Bonus is: no longer creative inventory in survival mode on certain login conditions
• Blocking beacons as chest in creative
• Multiverse-Inventories compatibility disable
• Blocking enchantment tables as benches in creative

developed for:

• Java 6 (JRE 1.5 may not supported in that build)
• CraftBukkit 1.4.7-R0.1
• WorldEdit 5.5
• WorldGuard 5.7

Even if the plugin is marked as release now (to prevent people from still downloading the very outdated versions), it hasn't got more testing then the current beta releases (meaning none).

This plugin isn't any longer actively developed

See Project Overview for more info.

• blocking all signs and chests isn't a good solution, but the minecraft-server lags the possibilities to intercept inventory-modifying for now
• breaking needed blocks lets drop attached ladders/doors/etc.