The friend who encouraged me to get my first computer with TTS showed me, very early on, how to rename a file and save it to a specific directory, and I still think this was probably one of the most useful things anyone ever taught me about using a computer. I'm always amazed when I hear computer users describe the unstructured nature of their computers (best system I've heard--from a guy, of course--was two directories: "smut" and "not smut.").