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!
IntenseDebate Comments Screenshot
Create an account and login to IntenseDebate directly from WordPress! Syncing your accounts enables auto-login so logging into WordPress automatically logs you into IntenseDebate. Profile sync also means that comments you make are synchronized to both profiles so you maintain ownership of your profile.
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.
Plugin homepage: http://intensedebate.com/wordpress