Guide on how you can easily add a button from the addthis.com service to your blog to make it much easier for readers to submit an article or page to services such as Digg, StumbleUpon, Furl, Facebook and more.

Works really well with Google Blogger.

How to make it easier for your blog readers to submit posts to Social Bookmarking sites
http://tech.nztechie.com/2008/01/add-this-to-your-blog.html