So,

• Articles are classified into main categories `/log (editorial, i.e. editors' playground)', `/lib (organized writings)', `/etc (about this site)', and whatever new categories that I might come up in future. The main categories are what you see at the page header.
• Some articles are marked to be summary posted at the front-page. If so, that's what you see at Home. Usually, I'll take the lazy default to have each article front-page posted.
• Drupal’s got a very fancy categorization scheme. It’s so fancy that it’s actually called Taxonomy. So, other than the few main categories, there are also infinite sub categories that I can apply. So, I’ve given it a try. Check for Category Browser at the left-hand menu. (To be more exact, Drupal has no differentiation for main and sub. It’s just my implementation.)
• If you want to identify where each article comes from (which category), note for a category identifier somewhere above/below the teaser. It depends on the theme that you choose. For the site default theme, it's at the bottom of each teaser.

Why the hassle to write this up? Because I was confused when I stepped into sites like Slashdot in the past - articles seemed to be everywhere and yet nowhere to be found afterwards. So, perhaps a little help for the new comers (if there is any...). Well, I am not always that sarcastic - I need to eat, sleep, and deal with normal human beings once in a while.