The AddThis Social Bookmarking Widget allows any visitor to bookmark and share your site easily with many popular services.
Get more traffic back to your site by installing the AddThis WordPress plugin. With AddThis, your users can promote your content by sharing to 295 of the most popular social networking and bookmarking sites (like Facebook, Twitter, Digg, StumbleUpon and MySpace). Our button is small, unobtrusive, quick to load and recognized all over the web.
Be sure to download the latest version of each plugin and upload them to your wp-content/plugins folder. Then activate them. Chip Themes will do the rest.
You may be interested to know more about this plugin.