WordPress.org

Authors: alexkingorg, ShareThis

The ShareThis WordPress plugin provides a quick, simple to use, and unobtrusive way for users to add your post to many social bookmarking sites, or to send your post link via email, AIM, Facebook, MySpace and more.

Be sure to start here:

http://sharethis.com/publisher?type=wpplugin

to customize the look of the ShareThis widget on your site as well as register for tracking of your sharing events.