Did you know that there’s a Greasemonkey script that allows you to share a Google Reader item on Twitter?
    

Selective Sharing

For those who may be debating on adding their Link Blog feed to your Twitter accounts, this could be a great solution. If you’re overwhelmed with feeds and share a lot of items daily, you may be a little hesitant to simply run your link blog feed to Twitter. Users may appreciate a good link or two on Twitter, but not everyone wants to be bombarded with them. The "Share with Twitter" Greasemonkey script is a great solution to this problem.
   

Rundown of Share with Twitter Greasemonkey script

• Format of tweeted link is: [Tag] Title(Note) URL

• Tag\title\URL are received from articles in Google Reader automatically, but you can edit them.
• URL can be converted into tinyURL.
• Before sending the messages, the words number will be counted.
• Sits in the bottom of an item where the "Share" and "Add Star" features are located
• Mini-window popup for editing
• One time user authentication

Surprisingly, this little gem has been out since 2007! Well, better late than never right? Be sure to have the Greasemonkey extension installed in your browser (Firefox), then grab the script here.