As Styleboost has been on hiatus for the past few months, there's quite a backlog of sites that should have been posted here a long time ago. Disqus is one such site. This is perhaps one of the most interesting experiments I've ever encountered when it comes to homepage designs. The interactive Disqus demo prominently placed in the center of the homepage just immediately pulls the user in. Not only is it a powerful visual cue, but it also quickly manages to show off the tool that is Disqus. Would be very interesting to see how well this converts new sign-ups for them.