Overall, the typography on your blog is pretty good. I'd definitely increase the contrast of the text though. Your measure is a little on the long side. A good guideline is to keep it under 80 characters. You're stretching it a bit at 90-ish characters, but you've got plenty of leading, so you can get away with it. If you reduced your measure a bit, you could reduce your leading a bit so your paragraphs would have a more natural density and better vertical rhythm.

http://en.wikipedia.org/wiki/Measure_(typography)

http://en.wikipedia.org/wiki/Leading

Note: You'll notice that CSS line height is not the same as leading, but old habits die hard, and I'm used to referring to it as leading.

http://blog.8thlight.com/chris-peak/2012/12/30/vertical-rhyt...