Bukkit

• Added: «Only let OPs join the server» (only if you set to true in config of course)
• Added the new craftbukkit build in the info command.
• Added: Disallow nether-portal creations.
• Added: Prevent lava and water from flowing.
• Added: Prevent pistons from extending and retracting.
• Improved the flint and steel procedure.
• Added a new class: iSafeWeatherListener.
• Added: Disable Storm, Thunder and Lightning Strike.
• Added new class: iSafeInventoryListener.
• Added: Prevent players from burning in a furnace and smelting in a furnace.
• Added a permission node to use lighters/flint and steel.
• Added new config nodes and one more permission node.

DO NOT USE THIS VERSION, THIS BUILD CORRUPTED AND IT MAY CORRUPT YOUR WORLD!

EDIT 2: I have found some bugs in the new build, and they're fixed soon.

EDIT 3: I have fixed the bugs, wait for a new version.