This plugin enables "XAuth" support for WordPress (http://xauth.org
From the website:
XAuth is an open platform for extending authentica
Rate 'n Tweet adds a rating system that forward the user to his Twitter page so the user can share it via Twitter.
Bubblecast video plugin is one of the best WordPress video plugin. Embed, upload or record video of your own or Youtube video into your blog posts
Publish new post or post update notifications to Ping.fm. You can share you're blog with 30+ social services.
Adds a button which lets users "Like" a page
The Like button enables users to make connections to your pages and share content back to their friends on Facebook with one click.
Add link to share the current post or page to social network VKontakte (vkontakte.ru, vk.com).
Bitly shared links generates a short url using bit.ly or j.mp to share your posts in social networks.
Own the search. Predict what your readers would look for, and bring it into your blog.
Add a Hao Hao Report submit/vote button to the bottom of each of your posts.
The Digg plugin provides an easy framework to add Digg buttons and Digg widgets to your page.
Displays Google Buzz This button for easily sharing an article to google buzz.
An easy to use photoblog plugin helps you to share your daily photos on your sidebar. With slideshow, photo archive, nice effects and ability to show
RSS link for this tag.