I removed Disqus because it has a big bug on Wordpress - if the post time of an advance post changes Disqus sticks to the original post date breaking all the links horribly. They know about this and say they will fix it. When they do I'll bring it back if everything works OK. This system has the benefit that you can edit your comment without having to log in or anything (for 15 minutes). Lots of people complained about Disqus being a bit of a hassle; no one else has complained about it going. Swings and roundabouts.