
Having explored Del.icio.us, I can see the relevance of creating a bookmarking account, if you are one to explore lots of websites. I personally don't see the need for it, as I don't explore that many websites or use the internet enough.
However, as a Librarian, I think it would be a great tool to use in our library. We have many workstations. and if we have a Del.icio.us account we can all access the same bookmarks. We won't have to set up the same bookmarks on each computer.
Its also a great tool for Social bookmarking, whereby you can see what other users (especially other libraries) are viewing by using the tags.