I use this to figure out the official Bukkit name of an item, and it's extra data (such as those stored in Durability, and lores).
- /itest or /itest help: displays a help menu
- /itest info : Displays the information about the item you're holding.
Just copy ItemTester.jar in the plugins folder.
- itemtester.info : allows a player to use /itemtester info command.