The website for disqus is clean and well organized. I like the the placement for the call(s) to action “sign up” & “learn more”, while there’s two of them treated equally visually, they are very centrally placed on the page. Then next to that is a really neat interactive piece. The magnifying glass effect over the illustration is very cool and sets a really nice tone for the website and service.
The signup form is also well designed, it’s as simple as it can be field wise and succinctly walks you through what disqus needs from you in order for you to start using it.