I've always had a difficult time keeping notes organized. I think because I'm a web developer I always have a gazillion projects going on. I can't justify having a notebook for each project. I've tried keeping up manilla folders with loose leaf papers, but that was a mess. I tried three-ring binders, but that's not very convenient. A few weeks ago I tried the bullet journal technique and it's been working out well for me. It combines your daily calendar / todo list with project notes. I think it's just the simple idea of having an index that helps me most.