Clone delicious and make basic functionality free (tags, search, public bookmarks) and make a paid service that includes all the "nice to haves" like private bo

Clone delicious and make basic functionality free (tags, search, public bookmarks) and make a paid service that includes all the "nice to haves" like private bookmarks, page caching, bookmark exporting/importing, etc. Also a noticeable difference from all these sites is that I when I go to delicious.com I immediately see what it does (bookmarks). All these other sites have a landing page to explain how they've made the simple process of saving links online more complicated.