Like all the teachers I know, I've tried many different ways of keeping notes of my conferring. I have tried the big 3-ring binder. I found it to be too bulky to carry around. I've tried notecards on a clipboard that flip up for each child, but I was also carrying a couple other folders with me too with other information I needed. I have to say, the nerd in me was uber excited when I realized that I could create my own notebook with everything I wanted to be spiral bound. Office Depot spiral bound it with sturdy black backing and clear cover for less than $4. I love it because with a spiral I can flip it back on itself and it doesn't take up much room.
Here are some photos: