When I first started using del.icio.us I though "great one more site to figure out." Then I asked a co-worker of mine a question and found that on their bookmarks he had some sites bookmarked. After looking through his bookmarks I realized I would be able to use a number of these as a teacher.
As a professional I can see many useful ways to use del.icio.us. The teacher I asked has already looked up and found a great website for weight training. So instead of me doing all the work and sifting through countless websites. I can use what others have already found.