Where can I find plans for more innovative bicycle-powered gadgets like these?

A bicycle is an energy-saving way to power a simple machine and get some exercise at the same time. Recently I’ve become aware of inventions using bicycle-like power inputs for such diverse tasks as washing clothes and a milling grain.

I’m impressed with this concept, and once I acquire a few acres, I might rig up some other human-powered machines. Have you ever done this? Or do you know of other machines that can be made to run this way? Thanks!