Since I'm part-time and pretty much out of the loop, it's hard for me to speculate on how the library can best take advantage of Web 2.0. I do think del.icio.us has some possibilities, esp. when for the reference librarians. Sometimes we manage to find a needed piece of information on the internet, but then are unable to duplicate the search later. Using del.icio.us might be of some help in avoiding that dilemma.