I often think about this, but at this time still prefer not using a third party for comments, especially on a site where the comments are so important.
Yep, I agree with you regarding third party comments for the most part, but I think by using Disqus there could be way less friction for account sign up in some circumstances.
In my case, there's another site that I frequent that has a huge Disqus community, but it is desperately in need of social bookmarking functionality. I'm considering launching an independent site to provide it.
Maybe you want to use the triangle, that was featured on HN a few days ago :) -- http://codepen.io/chriscoyier/full/lotjh
Is the source available for this anywhere? I would love to see some of it.