I've seen some sites that have URLs like:

site.com/articlexxxx

This is a neat trick I would like to be able to learn myself. Is $GET_ used to do this? I assume there isn't a folder on the server for each article (because there would really be a ton of them).

A real working example of these neat URLs: http://digg.com/technology/WHAT_EVER..._TO_CHANNEL_1_