Bukkit

Currently Implemented Features:

• Updated to be usable with 1.6.4 +
• Added full compatibility with trapped chests, dispensers, and droppers.
• Added ability for meta data and item names.
• New Sign Setup: Line 1: [ic], [infchest], [infinitechest] Line 2: (item id or name):(meta data) Line 3: (Stack amount 1-64)
• Anti-Bug added, if you try to put 0 or air as the block, it will break the sign. This causes many different issues when it is set to air.

Full Features upon Full Release:

• Updated to be usable with 1.6.4 +
• Added full compatibility with trapped chests, dispensers, droppers, and furnaces (As Fuel)
• Allow you to hide the sign in multiple ways. You can attach the sign directly to the the item, or up to 2 blocks away.
• Added ability for meta data and item names.
• New Sign Setup: Line 1: [ic], [infchest], [infinitechest] Line 2: (item id or name):(meta data) Line 3: (Stack amount 1-64)
• Anti-Bug added: If you try to put 0 or air as the block, it will break the sign. This causes many different issues when it is set to air.
• Anti-Bug added: If you try to put an metadata id that is not real, it will pop the sign
• Anti-Bug added: If you try to put a number below 1 or higher than 64 it will pop the sign.

Messages don't necessarily make sense.