Packrati.us = Twitter + Delicious

This is what I wish Delicious had done with Twitter. pinboard.in has this built-in, by the way. "This site provides a simple bookmarking service. We follow your twitter feed, and whenever one of your tweets contains URLs, we add them to your delicious.com bookmarks. Optionally, bookmark URLs in @replies to you. We'll even add a delicious tag identifying the sender if you like."