Fotobook is a WordPress plugin that will link to your Facebook account and import all of your photo albums into a page on your WordPress installation. It makes use of Facebook's API so importing your photos is a breeze
Smart Youtube is a WordPress Youtube plugin that allows you to easily insert Youtube videos/playlists into your post, comments and in your RSS feed. The plugin is designed to be small and fast and not use any external resources.
This plugin integrates your WordPress blog with your Twitter account allowing you to send new blog posts to Twitter as a tweet and and vice versa. Cross-promotion of a blog posts to Twitter is fairly common and can be automatically achieved with Twitter Tools. You can also create digests that consolidate all of your tweets. Also, the plugin is entirely pluggable and can be extended just like WordPress itself.
Lifestream is a plugin built on top of the WordPress platform. It allows you to effortlessly integrate your social network activity across the web with your blog.
