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.

Florian

A very simple bar for outgoing links in your posts.
Features:
<ul>
<li>Feature a “DiggBar like” or “Facebook like” to all external links in your posts</li>
<li>Whitelist for links that you do not want to apply the WP Super Bar</li>
<li>Share your links easly with facebook, digg, twitter, etc…</li>
<li>You can easly edit WP Super Bar CSS from your WordPress Backend</li>
<li>You can customise text and logo.</li>
</ul>

WP Super Bar

A very simple bar for outgoing links in your posts.

SEO Friendly Social Links vs WP Super Bar