Below are a few examples of the sorts of machines you can build using sockets. This barely scratches the surface of what you can do with them, let alone what you will be able to do with them as more content is added to the mod. Keep in mind that blocks from several other mods are used in these examples, including some from Thermal Expansion, BuildCraft, IC^2, Forestry, as well as some of my own mods, AS#B and GasCraft.
Route different resources through a single block:
Build a quick and convenient obsidian harvester:
Create portable energy storage blocks that work with both BuildCraft and IC^2 power:
Build complex redstone circuits using logic gates and other redstone sensitive modules:
Build an automated GasCraft algae farm:
Input or output energy, fluids, and items through a single face:
Blow up your friends with a landmine:
Harness the power of a river:
And if you don’t have a river, power your base using cows: