Maybe it's just me but I think the comments are too narrow and/or spaced out (ex, an entire new line for the reply link). There's only 30 comments here and I did quite a bit of scrolling. This will become mayhem with 100+ comments.
As for responsive design.. make this site open source and I'll do it for you. :) I've been doing a lot of responsive stuff lately so I love doing it.
Be nice. Or else.
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