This plugin provides an easy framework to add Digg buttons and Digg widgets to your page. Digg buttons help drive traffic to your content by allowing easy Digging and submission into the Digg ecosystem. Digg widgets allow you to supplement your content with the top stories from Digg either through the lens of your site or through a specific area or topic from Digg.
Out of the box, it allows you to:
<ul>
<li>Place yellow smart Digg buttons in the three size options: compact, medium and large. The yellow smart Digg buttons can tell if a web page has been Dugg or not and displays the proper number count. </li>
<li>Generate a customized Digg widget with different placement options. The widget generator can show the most Dugg content by domain, topic, search term or even show a particular user’s Dugg stories. After selecting the type of content to display, it’s easy to save that state and decide where to position it on a page.</li>
</ul>
The Digg plugin is developed and maintained by Digg Inc. and will be updated regularly as new capabilities are introduced to the Digg platform.

Digg

The Digg plugin provides an easy framework to add Digg buttons and Digg widgets to your page.

goldenapples

This plugin aims to support community link-sharing, social bookmarking, and discussion of links in the WordPress environment.
This is still at an early stage of what I hope will be a much more ambitious project. If you want to try this out, please give me feedback.
I will guarantee backwards compatibility with all data saved by the plugin, so it should be safe to install and activate, and as I add features, your existing posts and links will work with them just fine.
See the plugin’s <a href="https://github.com/goldenapples/recommended-links/wiki" rel="nofollow ugc">wiki page on github</a> for more up-to-date documentation (its hard to keep documentation updated in multiple places).

Digg vs Recommended Links for WordPress