Tagging your own links provides one of the best ways I know of creating organized structures for disorganized content. Or putting a framework and recall system around all of your links. Long gone are the days where "bookmark this page" is enough. And while #hashtags are also, important for recall and discovery, your own private tagging system might be even more important, in the long run. And learning to use and research on delicious is part of my critical path to social media execution.
My point was this: if you spend two hours Googling a subject and tracking down ideas for a new project, someone following in your delicious path can get to the same primary research in minutes. And if you add notes and thoughtful tags, you can help guide the next person down your thought process.