De.licio.us Tagging

I like the idea of a more free-form method of organization- tagging feels very organic for to me. The tag swarms on de.licio.us crack me up, because that's pretty much how my apartment is organized- nothing looks like it's in order, but I know where everything is. Most of the time. It's nice to see a links system online that's non-linear and organic. I see websites like de.licio.us working very well for research purposes, like http://www.refworks.com/.