The following wires are a part of the RedPower2 mod, and carry redstone logic signals or blutricity.
Wires can also be colored with wool, allowing all 16 minecraft colors. Different color wires do not connect to each other, but they can all connect to a Bundled Cable, which will output power to the corresponding colored wire on the other end.
You can even re-color the insulated wire! Inuslated wires of different colors will only connect to uninsulated wires, bundled wires, and wires of the same color. e.g: A white insulated wire will not connect to a blue insulated wire, but both can connect to an uninsulated wire,
Red Alloy Wires can be bundled together into Bundled Cables:
There are also blue alloy wires to carry blutricity: