The basic idea of the PPW is simple: I took a series of plastic sheet protectors, which provide a nice surface for Post-it notes to adhere to. Inside them, I placed sheets of card stock (file folders, cut down to 8-1/2 x 11) for rigidity, and I put the whole mess in a 3-ring binder.
Then Tammy creates different contexts on different sheet protectors. Pretty cool idea, I like it a lot.