Not really a hardware ~hack~ per se, but still....
We did this just today at the lab (orthopaedic research) as a little side fix-it project. I've never participated in anything like this so I excitedly made the page linked below and wanted to share it! What do you think?
http://www.angelfire.com/hero/amdpx/powerbook.htm
-Anthony
Nice job. Having someone who is competent and not afraid to have a looksy at something solves many problems. I'd sure like to have nice ladies hold projects for me to solder on, but my wife doesn't seem too thrilled to be that close to me and hundreds of degrees of heat in my hand... ::)