Facette, an MIT data organizing project, knows more about your Delicious bookmarks than you do. The free webapp and Firefox plug-in groups your links by what they're about, media types, and more. The simplest way to check out what a "faceted" Delicious list looks like is to add your username to the end of Facette's URL browser:
facette.csail.mit.edu/user/your user name here. You'll see a host of left-hand boxes that show different data types—general subject headings, blog post types, video and audio containers, and lots more. If that's something you want to see more of, head to Facette's main page and grab their Firefox plugin, which gives you the ability to add far more serious tags (pictured at right) when you're bookmarking, and automatically takes you to the Facette view of Delicious pages. Facette is free to use (though a user study sign-up is request), requires a Delicious account to scan private bookmarks.