Every year for the last 3 or 4, I've kept lists of all the books I've ready over the course of the year, and posted little descriptions/mini-reviews of them at the end of the year. It has become a new year's tradition for me. I notice lots of things as I peruse the list each year - I remember where I was when I read certain things, or remember projects I worked on for which I read certain books. It's a great year in review for me every time.