Below is a list of websites like del.icio.us / services like / similar to del.icio.us :
Delicious is a social bookmarking service that allows users to tag, save, manage and share web pages from a centralized source. With emphasis on the power of the community, Delicious greatly improves how people discover, remember and share on the Internet.
Bookmark any site on the Internet, and get to it from anywhere: Instead of having different bookmarks on every computer, Delicious makes it easy to have a single set of bookmarks kept in sync between all of your computers. Even if you're not on a computer you own, you can still get to your bookmarks on the Delicious website.
Share your bookmarks, and get bookmarks in return: If your friends use Delicious, you can send them interesting bookmarks that they can check out the next time they log in. .