Ask HN: How do you name your (information) stuff?

Specifically, how to you tag or categorize your information?

You can tag/label your email, your bookmarks, your files (by being in a named directory), your papers (drawer labels and folder labels).

Do you bother to categorize at all, or do you just dump stuff in directories and drawers, and don't tag your bookmarks, relying on search?

If you tag/categorize, do you use a few broad categories, or do you use a lot of small, fine categories?

Do you use your own categories, or do you base your categories on some existing categorization?