Weblogs create archives of valuable and interesting writing. Some of that writing is ephemeral, but even cheese sandwiches can have lasting interest. But when old posts wind up in linear archives, they're effectively lost to everyone but Google.
This doesn't have to be true: we simply need to use the power of hypertext. The old TINAC manifesto said, "two links per note or it's not a hypertext!" Adding just a few links to a weblog lets us invite readers more deeply into our work.
Categories and tags and the like are all efforts to build value from archives. They usually fail, because they ask you to work now to get benefits later, and because their value diminishes if you don't use them every single day. Perhaps some automatic links might help.
The Link Apprentice suggests: File Wear.