Bukkit

v1.5

• Bug fixes.
• Optimized portals.
• Added per world default gamemodes.
• Added ingame config editor (only via commands)
• Added inventory per world support.
• Added the ability to fully delete worlds with the server online.

v1.4

• Bug fixes.
• Added warp portals.

v1.3

• Bug fixes.
• Added per world join titles.
• Ability to disable the creation and use of nether portals.
• Ability to limit number of mobs per world.
• Ability to disable explosions.
• Ability to disable player interaction.

v1.2

• Bug fixes.
• Added permission to override event.
• Added sign support: Amount of players in a world, status of a world and world teleport sign have been added.

v1.1

• Added auto-update support.

v1.0

• First release

- Can't seem to unload non custom worlds.