I first discovered this website when I was looking at plug in's for Firefox, and this plug in is fantastic.
Never loose a bookmark again! What I love about it you can access it from anywhere, you just log into delicious and all your bookmarks are linked there. You can also tag them into groups, like shopping, photography, social network etc.
My user name for delicious is moonke. The reason I'm giving you my user name is because if you join and put me down as a friend you can access my bookmarks, and vice versa.