At one point in time, I was jotting down zone values and development adjustments for each roll of B&W in a little notebook I keep in my camera bag... I used to make my own little zone diagram like CPorter's example provided. I haven't really done that lately, since I generally don't take that camera bag (along with the little notebook) out with me. I keep trying to get back in the habit, but it's been to easy to be lazy. I just hate it when I get a nice exposure and I can't remember how I captured it...

I think everyone's contributions above just might help me get back into the habit of recording information again! Hopefully!