You may have noticed I recently installed the DISQUS Commenting system across The Free Advertising Blog, Top Affiliate Marketing Blog and here. This is a pretty robust commenting plugin with some builtin social network marketing capability (ie. Twitter and CoComment).
With one DISQUS account I can add all my blogs and manage their comments within one central repository. No more creating profiles for every site under the sun to get your message out to the broadest audience possible. If you're running a number of blogs the ease of management using DISQUS can save you a great deal of time
Installation is a snap too. I use WordPress across all of my blogs and the DISQUS plugin is just as easy to install as any other WordPres plugin. More to come on customizing this commenting system in the future.