Automattic, the company behind wordpress acquired IntenseDebate, one of the comment enhancement systems. IntenseDebate launched last year with features like ratings, comment threading, OpenID support etc. IntenseDebate provides community features likevoting, reputation, profiles, reply by email among others.
Automattic says that InteseDebate will stay as an independent service, much like Akismet Automattic’s other product. In the near future the features of ID will be integrated to WordPress core, WordPress.com and Gravatar.
IntenseDebate closed to registrations for the moment, and they will reopen once they scale up the infrastructure to support much larger wordpress user base. Who are already using ID can use it with out any worries. ID supports other blog platforms apart from WordPress.