Today, kaishin and kvlly kinda forced me to use DISQUS for the comments on my blog here, rather than the native WordPress comments. Installing it was easy (they have a very nice WordPress plugin), tweaking the design a bit tricky but in the end it was really worth the effort.
I can really recommend this system if you want to make commenting on your website painless for the user (which should be in your interest, eh?).
And now, DISQUS this post!