Twitious , by Develop with Style in about two weeks, does an inventive step by bookmarking your tweeted links instead of tweeting your bookmarks. I was able to find users already acessing the system. They are built a homepage showing the number of bookmarks made, the tags associated with them and then their Tiwtter stats for number of followers/following.
Images are brought in for each site bookmarked to give you a thumbnail approach. While not always perfect, many did help. I found user pages and a page with the most recent bookmarks made from all over. It gave me hope that this might prove useful. But..
I am guessing that development stopped as tweets for the account ceased back in November 2010. I would have written a longer review, but after authenticating with oAuth it said something went wrong and would never let me in any further.