Delicious is a crappy research tool. I can usually find something faster by searching it on Google than by digging through my moderately massive library of links. However, the one thing Delicious is good for (besides the occasional project-specific tag-based RSS feed) is Wordle. I was really excited when I had enough momentum for a cool looking and fairly accurate jigsaw-thingie of awesomeness everyone seems to have nowadays. I even sortof look like a specialist from this angle. That’s an artifact of my colleague Brad and I using delicious to catalogue our entire bibliography for the first year of the Global Food Outlook program*.
*I'm co-director now am I? That's gotta be a misprint!