Somehow I don't find the typography satisfying. It is hard to read and explore the titles. HN does a better job at this even though your site looks prettier.
The same goes for telesc.pe mentioned by sgdesign.
Helvetica Neue at that font weight needs a larger size for legibility. See Parse using the same font in their docs at 16px[0].
[0] https://parse.com/docs/js_guide
I like it a lot but there seems to be some performance problem when you have a couple of comments there, for example http://demo.telesc.pe/posts/a05eba73-cdd9-4d64-933d-2586ffc5... takes a couple of seconds to load on my 27" iMac in Firefox and even shows me the beachball of death for a couple of seconds before it gets rendered. It only has 335 comments.
It's loading ok for me. But in any case, this demo is running on a free instance hosted by Meteor (the company), it would probably run much better on a production instance.
hmmmm if the wait is being caused by processing of the heavy meteor frontend code, as I suspect, then "it works fine for me" is actually an indictment, and "it's on a free server" is no defense.