The folder approach is handy for getting things out of the main inbox, though. Labels/tags/categories are useful for searching, but for wholesale organizing you

The folder approach is handy for getting things out of the main inbox, though. Labels/tags/categories are useful for searching, but for wholesale organizing you can't beat the folder. Of course, I say that, but my current method uses the One Big Pile system and I delete year-before-last every January.