Normally I'd be against such a harsh gradient for the background, but I actually like it.
The whole site is organized really well, and it looks pretty nice too. Clean and simple. If I had to make a complaint regarding aesthetics, it would be that you need some color in the header area.
Oh, and something you might like to do for the blog area is get rid of the border-bottom for the last post. This can be done easily with
Code:
div#post:last-child { border-bottom: 0 }
or something similar.
You should've seen the smile on my face when I resized the browser window and your layout adapted to it 
Great work.
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