Minecraft 1.5 is released!
This gives me reason to start uploading some signal strength logic.
To start off with: This is the 4 bits signal strength adder I've designed a few months ago in a snapshot.

The world download is in the schematic zip file

Specifications:
-Hexadecimal (First bit = value*16^0, second bit = Value*16^1, n-th bit = Value*16^n).
-Adds 2 numbers between 0 and 65535.
-Stackable design to infinite bits.
-Subtraction can be added easily, in order to do this: Invert either input A or B and toggle the lever on the right side.
Subtraction with a hexadecimal adder is very, very similar to subtraction with a decimal adder.

I still don't know what I could use this for. I've build a signal strength RAM drive which could be used with this too. The RAM will probably be uploaded when bukkit and worldedit get updated to version 1.5 too.

I hope you like it.

Meow,
Pieter12345