This plugin automatically displays Google Buzz button for every post and pages.
Integrate a WordPress site with the Receive Links Link Exchange Network. This plugin works with widgets or in the footer. You need a Receive Links account.
A HTML sitemap with both post and pages. Easy to implement, just add a shortcode
More at: http://weblogtoolscollection.com/archives/2010/02/15/wordpress-plugin-releases-for-0215/