I have been thinking I should move my bookkmarks to Delicious for a while, so I am happy that I will have to do that in the next thing! I haven't had any problems finding my bookmarks on my computer (I am a librarian; I can organize fairly well), however, issues arise if I buy another computer and don't transfer my bookmarks. I can see that Delicious will also be helpful for sharing sites in an educational environment. My bookmarks are mainly sites for my personal use, but I could make more use of bookmarks in the social-bookmark world and share sites with colleagues.
The tips for tagging article brings up good points. I will refer to them when I start tagging my own social bookmarks.