TwitThis is cool. The TwitThis plugin adds a “TwitThis” badge for each post on your WordPress site. TwitThis doesn’t send tweets when you’re writing a new post or editing an existing post like the Twitter Updater plugin. TwitThis makes it easy for your readers to let the world know they’re reading one of your posts or performing some other action on your site.
TwitThis is an easy way for people to send Twitter messages about your
blog post or website. When visitors to your website click on the
TwitThis button or link, it takes the URL of the webpage and creates a
shorter URL using TinyURL. Then visitors can send this shortened URL
and a description of the web page to all of their friends on Twitter
You can see TwitThis in action right here at longren.org. The TwitThis badge should be immediately below the Share This badge.