For IFR plates, the best is to get a 2-ring file and cut out a roughly A5-sized chunk from the back, such that you end up with the two rings at the top. Some gaffer tape and a strip of velcro, and you have a knee board that allows you to easily flip between plates in a confined cockpit. Unlike the clipboard-style clips, when you flip a plate up (so it hangs down your knee), it doesn't keep popping back when you aren't looking. A few tabs out the side (made from the sticky strips of post-it notes) make it easy to find a set of plates, too.