I use a dictating machine to make the initial records and then write it up later into an ordinary notebook. It suits me anyway.
I do agree about a chair in the darkroom - just a three or four hour darkroom session leaves me feeling like I've done a full day's work.
But my most useful accessory has to be an electric fan. I've never worked out why the simple act of switching off the main room lights seems to make the ambient temperature rise, or how it instantly returns to normal when I switch them on again and read my thermometers.