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Overall I like it. It's pleasing and well organized. My suggestions for improvement are typographical.
Leading is all over the place. I would prefer to see more care taken to ensure the vertical rhythm is maintained. Example, the blog page: The headlines are way to spaced out, when compared to the sidebar headers. Also there is no horizontal grid or consistency between the two columns. Those items are easy to fix though.
The second thing, that I am not to keen on, are the large images on the blog page. They force the content into a narrow column, and reduce readability. It also makes the page look as if all three columns have the same importance. So there isn't a sense of hierarchy anywhere.
