akrabat

The DiggBar is a URL shortening service that puts your website within a frame on digg.com. As a result, the user sees Digg’s URL, rather than your URL in their address bar, no matter which page they navigate to on your site. You can see an example DiggBar URL that points to google.com: <a href="http://digg.com/http://google.com" rel="nofollow ugc">http://digg.com/http://google.com</a> which is automatically converted to <a href="http://digg.com/d1nYVs" rel="nofollow ugc">http://digg.com/d1nYVs</a>.
The No DiggBar WordPress plugin automatically redirects anyone using the DiggBar service, so that your site’s URL is displayed in the address bar of the browser.

No DiggBar

This plugin redirects DiggBar users to your actual site.

Scott Grayban

It puts a bar of icons at the bottom of each post allowing your readers to submit your posts to several different 
social networking and bookmarking sites. (del.icio.us, digg, fark, etc.)
The original plugin was called <a href="http://blog.calevans.com/2006/02/08/notable-another-wordpress-plugin/" rel="nofollow ugc">wp-notable</a> 
but no longer worked or was supported. The author was Cal Evans.

notable

Adds social bookmark links to each blog entry.

No DiggBar vs notable