This rather different approach to filing treats the file cabinet as a "stack". When you file something, you put it at the front of the shelf. When you pull it to work with it, you return it to the front of the shelf when you're done. This results in the files naturally moving to the back of the shelf if you're not working with them, and staying near the front of the shelf if you refer to them frequently.
On the one hand, intriguing. On the other hand, sounds an awful lot like the pile of folders I had on my desk before I learned to file things away.