Michael Henke

Insert SEO friendly/neutral links to social networks and bookmarking services. This plugin is proudly provided by <a href="http://www.all-things-seo.com" rel="nofollow ugc">all-things-seo.com</a>.
If you don’t know yet, find out what a <a href="http://www.all-things-seo.com/seo/seo-friendly-social-links/" rel="nofollow ugc">SEO friendly link</a> is. These Links can be inserted automatically above or below each post or manually (e.g. in the theme).
The plugin ships with support for Twitter, Facebook, digg, delicious, buzz, reddit, StumbleUpon, …extend the list by customizing your own services

SEO Friendly Social Links

Insert SEO friendly/neutral links to social networks and bookmarking services.

johnlawrence

PopuList allows you to track the popularity of your posts on social bookmarking sites reddit, stumbleupon, del.icio.us and digg. When PopuList is activated, a page is added to your dashboard giving the number of times a page has been saved or upvoted.
New in version 1.5 PopuList now also lets you view backlinks as indexed by Google and Yahoo.

Populist

Track the popularity of your posts on social bookmarking sites reddit, stumbleupon, del.icio.us and digg

SEO Friendly Social Links vs Populist