A heirarchial (did I spell that right?) folder system, where all the folders can be nested inside each other. Here's how it works: Drag a selection (you can't click on it) over one or more folders to select them. Then you can drag the selection to another folder. Double-click a folder to enter it. To leave a folder (to its parent), click the arrow in the lower left-hand corner. You can also drag a selection of folders to the arrow to send them up one level. I've wanted to do this for a long time, and with lists it's finally possible! Have fun! UPDATE: 20 folders was a bit much, so I removed ten and fixed a few glitches.
