I have two sets of del.icio.us links. Del.icio.us is an online social bookmarking site, useful for discovering new sites and pages and a good place to put bookmarks if you use multiple computers.
The first one (thundros) is mainly used for personal links, whether they be tech related, fun links or just about anything I find interesting. The second one (cubickarma) is used for links related to my PhD research work (useful when preparing for work, paper writing, experiments, etc.).