I’ve only recently grasped the power and potential of social bookmarking sites. I love being able to access my bookmarks from anywhere and the ability to categorize them with mutilple tags.
I’m a staunch Google fan, so I’m a little ashamed to admit that I love Yahoo’s MyWeb. It’s a social bookmarking site with a twist. It saves a copy of the site you are tagging so that if it changes, or the site is down, you always have a copy of what you were originally interested in.
The only benefit I still see in using del.icio.us is the tight Firefox integration. When I combine the del.icio.us extension with my greasemonkey userscript def.oc.us, adding a bookmark is as easy at hitting Ctrl-Shift-/, typing some tags and hitting enter.
I’m planning on doing the same thing for MyWeb.

