This new Joomla! plugin was built as a superior replacement for the old Social Bookmarking Buttons plugin for Joomla 1.0.x. The Ultimate Social Bookmarking plugin is the best extension available because it puts the buttons where you want them, allows an unlimited amount of customization, and is compatible with Joomla! 1.0.x and Joomla! 1.5 natively.
This useful Joomla! Plugin (Mambot) adds social bookmarking buttons to every piece of content, static content, or all content in your CMS. It includes quick "bookmark" buttons for Digg, Reddit, Del.icio.us, Google Bookmarks, Windows Live, Facebook, Slashdot, Netscape, Technorati, StumbleUpon, Spurl, Wists, Simpy, Newsline, Blinklist, Furl, Fark, Blogmarks, Yahoo! Bookmarks, Smarking, Netvouz, Shadows, RawSugar, Ma.gnolia, PlugIM, Squidoo, BlogMemes, FeedMeLinks, BlinkBits, Tailrank and linkaGoGo. New functionality makes this plugin extremely customizable for any Joomla! installation. 
