Hipster PDA

I was at a meeting today, and I noticed that one of the facilitators had a Hipster PDA, which consists of a few 3x5 index cards binder clipped together. I can't tell you how valuable a thing that this is, and how it has helped me remember things that otherwise would have fallen through the cracks. It is one of those dumb (dorky) ideas that just work and that I am absolutely sold on.