Fleck Social Bookmarking and Your URL to Twitter
There are numerous social bookmarking services that hook to Twitter, but this one specifies the Fleck Lite version specifically for Twitter users. Sign-up was one page, simply enter your (gasp!) username and password for Twitter, create an account on their service and use the bookmarklet.
Fleck – social bookmarking and URL’s to Twitter « EverythingTwitter.