I think I'm onto something.
Requirements: moveable, re-arrangeable, accessible
Today's requirement: something already on my desk, or at least in this room
Solution: I think this can work. They're notepad sized, color codeable, and I already have some. I can take notes onto them, at the end of the day put them up in their places in a board divided into places into which to put them ("School" "Home/Office" "Writing Ideas" ... etc) and then when I need them I'll just take them down and use them. More flexible than spiral notebooks, less easily lost than naked 3x5 cards. Yeah. I think this could work. And this is me, taking notes as I go.
Now ... where was I?