Version 1.3.14 - Recommended
Applied Energistics - ME Networks provide:
Simple but robust automation tools, and great support for working with other other automation mods.
Includes a system which lets you create and use an automated crafting system.
Ways to include other storage from other mods or the vanilla game.
Lets you monitor your storage and trigger things via redstone.
Ways to alter your setup on redstone signal.
Save yourself a little time with wireless storage access.
Unofficially updated for 1.6.4 by Eximius88.
1) You don't need it installed client-side if you're playing in multiplayer
2) It doesn't use any item IDs or block IDs, so installing is just a case of dropping it into the mods folder
3) You'll rarely need to update it. Methods are all pulled from a remotely hosted configuration file in the github repository, so it'll regularly update without you needing to do anything
What does it do?
It turns various blocks within the game into peripherals, and exposes methods for you to call from the computer.