I can usually find an unused check register to make notes in... inexpensive and it fits in pockets. 🙂 This would be mainly for travel, as I make notes in a computer database when getting back home from local shooting and the recollection is fresh. The main thing for me (after date/camera/lens) is the location/subject identification. When returning from travel, I'll transcribe the check register notes into that computer database and add commentary as needed. I assign a "roll number" to each batch of shots. So at this point I can search the database later to get close to a specific shot if I want.