Disqus is a service that makes commenting kind of easier.
And also kind of harder.
I don’t really need Disqus on the blog site. Still - what harm can it do?
It’s a bit funny that the official Disqus plugin for Movable Type doesn’t work that well, while the unofficial Drupal plugin works like a charm.
So I kind of struck middle ground here. You can comment on the blog using both Disqus and native MovableType OpenID commenting. Disqus is easier if you have a Disqus account, in all likelihood.