IntenseDebate Comments enhance and encourage conversation on your blog or website. Custom integration with your WordPress admin panel makes moderation a piece of cake. Comment threading, reply-by-email, user accounts and reputations, comment voting, along with Twitter and friendfeed integrations enrich your readers’ experience and make more of the internet aware of your blog and comments which drives traffic to you!
Full comment and account data sync between Intense Debate and WordPress ensures that you will always have your comments stored locally on your own server.
Note: IntenseDebate is currently being maintained, but not actively developed.
This plugin is available for download to be used on your WordPress self-hosted installation.