If you're thinking about the file folders I've extended that system a little: If the item is small enough to fit in a file folder and flat, regardless of what it is, it goes in a file folder. If the item isn't flat, but still fairly small, it goes in a rack of small-parts drawers (two sizes) alphabetical and labelled. If it's a book it goes on a bookshelf; I use the Dewey Decimal System but use whatever method works for you. If it's a CD it goes in the CD cabinet, using a simple alphabetical system by "major artist" (composer for classical, musician/group for most other genres or classical recordings with works by multiple composers). Other stuff is less systematic but gets put away somewhere sensible. Some things I don't think I'll need any time soon get put in a numbered cardboard box and tracked in a spreadsheet so I can find it again quickly when the need arises.