Always by type in a tree-structure of directories. By the time you've selected down finer and finer details you'll probably find you've only got a dozen or so f

Always by type in a tree-structure of directories. By the time you've selected down finer and finer details you'll probably find you've only got a dozen or so files left to search carefully through for your information. But, mind you, belt-n-braces. It never hurts to have a key-word index too.