The thing I find would be most useful to me with Delicious are being able to access my bookmarks no matter where I am. I absolutely love the Toms River Information Services link.
The only problem I ran into with Delicious was when I downloade it to my home laptop, I immediately had a virus that had a bunny running across the screen and the computer crashing. I restored everything and have since used Delicious without a problem. Could just of been a coincidence. Delicious is a great social network for tagging and sharing.