Is that you Joshua Schachter? Del.icio.us was one of the greatest, and most underrated ideas to come out of the early web. For a while I would use del.icio.us as a search engine because it often gave better results than Google. If you can beat Google in search even in a limited area you are onto something big. (Am I remembering correctly that del.icio.us "static" pages would actually show as top Google hits?) Sadly del.icio.us has languished over the years under various owners. I still use it though and have a few thousand links saved.