Tweetie for mac just came out as you may know, and they had a bookmarklet that would post a link to the site that you were browsing to Twitter via Tweetie. The only thing that was posted, however, was the link. I wanted it to post the title of the page as well. I took a quick look at the code for the bookmarklet, and came up with the following replacement. This will post to Twitter in the following format:
Document Title: Link.
Just drag it into your bookmarks bar!
Post with Tweetie