[cowsaysoink]

Can you remove position:fixed from the header css, it makes more sense when that theme is used as a doc but for a blog it is unnecessary.

[nitrogen]

Seconded. You mention distraction-free writing in your blog post; position:fixed headers make for the opposite of distraction-free reading.

Edit: also, the return link from a footnote hides the footnote behind the header. I'll point out, though, that overall the theme looks very good and I like the idea. I'll probably do something similar in my own migration away from Posterous.