Project Red is all about redstone. If you love redstone, you'll wonder how you ever lived without it. It allows you to do so many things, and in a lot cleaner and more compact environment then doing them with normal redstone would allow.
The two main things added by Project Red are Wires and Logic Gates. Wires work sort of like redstone dust, except they can be transmitted for up to 256 blocks, and go up and under blocks as well as around corners. Logic gates allow you to fit what would otherwise take a huge building of redstone craziness and squeeze it into a tiny logic gate, that can be placed on any solid block on any side.MORE INFO