I came across this trick in one of Richard Bandler's books and knew the GTD community could benefit from it:
"One of our students has a couple of businesses and has to file a lot of papers and records. Whenever something has to be filed, he asks himself, "Where would I look for this when I need it," and starts moving toward the file cabinet. As he does this, an image of a particular file tab appears in his mind, and he files it there. This method uses what he has already remembered to organize his files, so he seldom has to remember anything new. Each time he files this item he strengthens the existing connection between it and the file tab, making the system more dependable each time."