I really like the idea and also how it looks, but the main reason I balk at using something like Disqus is that I hate having to pull in javascript from domains

I really like the idea and also how it looks, but the main reason I balk at using something like Disqus is that I hate having to pull in javascript from domains and servers I don't control on personal sites. I think there is a large market for an open-source library that you can just drop in that functions exactly like this... particularly if you can manage to get it to run entirely client-side.