paul1999

This plugin blocks your blog from being accessed by the DiggBar. This message is displayed to the user:
The DiggBar is blocked on this blog. <a href="http://daringfireball.net/2009/04/how_to_block_the_diggbar" rel="nofollow ugc">Read why</a>.
<h4>Credits</h4>
Digg blocking php code by <a href="http://daringfireball.net/2009/04/how_to_block_the_diggbar" rel="nofollow ugc">John Gruber</a>.

Block Diggbar

This plugin blocks your blog from being accessed by the DiggBar.

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.

Block Diggbar vs notable