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.

Gombos Robert

A simple and light plugin to add social bookmarks buttons to post and pages. I’m focusing in collecting non-english bookmarks services.

Bookmark Me

Bookmark Me is a plugin to add bookmark buttons (even non english bookmark sites) to your post or page.

SEO Friendly Social Links vs Bookmark Me