The Disqus WordPress plugin integrates your websites comments with the Disqus social network commenting system. “DISQUS is a networked platform connecting millions of people across thousands of communities. Does your website use it?”- via Disqus.com I started noticing web-forward sites like Mashable and Techcrunch were using Disqus and I have been using it for over a year now.
According to a Techcrunch article I read last November, the company has reached 95 million in the U.S. alone and over 500,00 websites and online communities tapping in to the service, via plugins and it’s API.

I guess I should tell you a little about Disqus first. Disqus is a social network commenting system. You create a Disqus profile, and whenever you are logged in, you can leave a comment at any website that used Disqus to power it’s comments. By using the wordpress plugin for Disqus you still maintain control over your comments, but gain the benefits of a cleaner design and more options for your readers when leaving comments. Your readers do not have to be logged in to leave a comment, but if they are, their comment will go towards the over all amount of comments in their profile. Also, if their Disqus account is linked to Twitter or Facebook they will be able to share it there as well.
The plugin is easy to install and will integrate into your WordPress site easily. I do not recommend many WordPress plugins, but this one was made by great developers in conjunction with Disqus, so in all likelyhood will be supported and updated frequently.
It also links your account with your website, so if I leave a comment on another site, it automatically links back to my site through my username listed above the comment I left.
Download the plugin here: http://wordpress.org/extend/plugins/disqus-comment-system/
Check out my Disqus user account here: http://disqus.com/andrewjtalcott/