Evolution of the Computer Mouse
The Wired blog has photos on the evolution on that thing that goes "clicky-clicky" and accompanies millions upon millions of PCs/laptops all around the world. Yes, the photos are dedicated to the computer mouse (not the type that goes "squeeky-squeeky", unless the scroll button is giving problems) and each photo is accompanied by interesting molasses of information.
Read (more like look at pretty pictures) all about it at http://blog.wired.com/wiredphotos62/