This question generated a personal needs analysis to find out what kind of knowledge management system is used and if it was adequate to meet the needs of a person with ADD. In the process of my analysis, I came to the conclusion that I really didn't have an established personal knowledge management (PKM) system that was useful or effective. I simply did what I've always done, cobbled together whatever notes I was able to remember or copy down in a hope that I captured everything. While this has been moderately successful on some level throughout my life, my analysis told me that I could do better.
That drove me to find a better system, a way that a mind that runs a million miles a minute in ten different directions can reasonably capture and organize information when it appears rather than trying to remember later what I was thinking about.
Thankfully in today's age of interconnected technologies, I was able to develop and implement a system that I feel is better suited to take advantage of technology and augment the way my ADD mind works to maximize the amount of data and knowledge that I can capture and organize.
Chaotic Designs Podcast - ADD and PKM