This is awesome. I’ve used systems very similar to this for a variety of things, but never knew it had a name, although of course it makes sense that it does. As I read this page about it, I am very tempted to use this for more things more often. I like it!
New documents (envelopes) are added at the left end of the “envelope buffer,” and whenever a document is used (i.e., the envelope removed from the shelf), it is returned to the left end of the bookshelf. The result of this system is that the most recent (and frequently) used documents migrate to the left, while documents that are not used often or not used at all migrate to the right. After the system has been in use for a while, the shelf starts to look like the following. …
(via BoingBoing)