Maintaining useful business documentation
imp: When I'm doing work on my own projects, I prefer to work with a sharpie marker and blank paper.  It's the easiest way to get my ideas out as quickly as possible.  The downside is that it's not digitized or searchable.  Usually when I'm done writing and sketching out a lot of ideas, I'll just put those papers into a manila folder with a descriptive label and file it away.  I bought a nice filing cabinet and label maker last year when I started doing GTD, so it works pretty well.  Every meaningful thought is documented, and it's pretty easy to find it when I need it.