Haha del.ico.us actually died for me when it moved to delicous.com. Used to be kind of popular with academics and librarians too at that time.
Not sure why I got downvoted. I was the first comment and just trying to clarify which site the submitter was talking about (since he said "delicious.com").
The same product was served under both domains at different points in its life.
I upvoted you because I didn't know that delicious.com was del.icio.us.com until I read the comments.