Bukkit

• 1.1: Fixed nullPointerException on startup
• 1.3.1:3:
• New versioning system.
• Added more configuration.
• Added another zombie effect (Poison)
• Made zombies faster.
• Fixed unkownMajorMinorVersion error. (Now use 64 bit version or 32 bit version depending on your setup)
• 1.3.1:4:
• Fixed config reloading unnecessarily
• Made aggro range of zombies configurable

Might break because the plugin version is not updated, even though the plugin itself is. Only 1 case of this, so don't worry too hard.