I've tried all the normal adders on Youtube and the minecraft wiki but i was wondering how many unique ideas I'm missing out on. Post your videos and ideas here please.
I came up with a rather neat idea. If you take a system in which the numerical value of the input is the number of pulses of an output, then you can make the output connect to a binary adder, and then you can add an infinite number of numbers together, not just two. This is probably not original, but I thought of it independently and thought it could be helpful.
http://www.minecraftforum.net/topic/1280851-new-additonsubtraction-counter-2x3x2-per-segment/
World download:
http://www66.zippyshare.com/v/65549422/file.html