Click to Tweet lets you easily create “Tweet about this” links to use on your website, blog, or Twitter.
To start using the service, visit www.clicktotweet.com (no signup required). Write the message you want to share in the box, click the “Generate” button, and copy and paste the custom link on your page.
Whenever someone clicks the link, the message will automatically populate their Twitter status box. All they have to do is send the message.
Here is an example:
Make your content more shareable on Twitter with Click to Tweet (Click to Tweet)