Furl is Way Cool

My furl stash has now grown to over 4000 public items. I use it to bookmark interests, research & fodder for future tasks. You can add comments & clippings. You can make things private & rate things. I'm clearly hooked. I also use del.icio.us, but to a lesser extent. My del.icio.us bookmarks are here. Both of these social bookmarking sites have their advantages and drawbacks. Why do you like one or the other? Do you use others? If so why?