Fetch, store (cache) and display, a tiny-version of the URL of each post. Allow your users to re-twitt it in one click. You can specify the RT default
This plugin will allow your readers to publish a RT (Re-Twitt) on twitter, quoting the user name of your choice, your post's (or page) title and its url (shortened by http://yurl.fr/ )
Now uses directly Twitter interface. Should increase "RT rate".