Bukkit

• Add support for new entity types and variables.
• Add support for new enchantments.
• Replace MCStats with bStats for metrics.
• Implement a completely redesigned system to edit tiles, items and entities. Everything is based on variables.
• Remove many commands (/nbtarmor, /nbtbook and /nbthead) and sub-commands in favor of the new system.
• Fix some problems with the old custom items (they are still usable).
• Many other small changes and improvements.

The BoSs should still be compatible. You should update all old BoSs from previous versions with the '/bos refresh' command. I may make some changes in a future version that will break old BoSs that were not refreshed. Make copies before (e.g. /is command), just in case.

The documentation is being moved to the new wiki on GitHub. Check the updated commands list.