Every morning, I write down what I cooked for dinner the night before, along with any special methods or sources. (I also note l/o [leftovers] and what, if anything, I've done to augment or change them. Rarer is the notation t/o [takeout].) I'll thumb through last year's diary to see what I cooked in a particular week/month. Also, since I tend to be experimental, I like to keep track of successes and failures, and sometimes just to be reminded of things that we really liked that I haven't remembered to make in a while. My friends find this habit peculiar, to say the least. Do you?