The Multiplayer Update

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Blocks

 * Explosive Mines (like SecurityCraft)
 * Keypad (SecurityCraft)
 * Obsidian Pressure Plate
 * Computer (ComputerCraft)
 * Mining Turtle (ComputerCraft)
 * Melee Turtle (ComputerCraft)
 * Lumberjack Turtle (ComputerCraft)
 * Storage Turtle (Computer Craft)
 * Iron Spikes, damages anyone who walks on them.
 * Smelt Glowstone to get Smooth Glowstone
 * Angel Block, from Extra Utilities mod.
 * Blackout Curtains, Extra Utilities
 * Ethereal Glass

Electricity/Redstone

 * Added electrified fence, must be powered by electricity to run
 * Spike Pistons
 * Sound Muffler, Extra Utilities.
 * Obsidian TNT
 * Redstone Grenade, sets off redstone but is non-terrain damaging. Tux Weapons

Weapons/Tools

 * Binoculars
 * Shield, like the one in Asgard Shields mod.
 * Destruction Pickaxe
 * Erosion Spade
 * Etheric Blade
 * Healing Axe
 * Builder's Tool
 * Sonar Goggles
 * Self-Destruct Mechanism

Materials

 * Unstable Ingot, Extra Utilities
 * Kevlar Ingot, crafted from a Plastic Ingot and string in an Alloy Furnace.

Enchantments

 * Concealed, makes it look like to other players you're not holding anything

Armor

 * Bulletproof Vest, crafted from Kevlar.
 * Bulletproof Helmet, crafted from Kevlar
 * Night Vision Goggles