I switched to HTML 5. A nerd blog should have a nerdy doctype. There’s not much to say about it. I replaced the first div in the old HTML with a new element called header, I replaced the following divs which are direct children of the body with the new element section, I replaced the div that was a child of the section with the element article and replaced the last div of the page with the element nav. I could have chosen the element footer, but I think nav describes its purpose better. I don’t have an aside so I don’t need that element.
Some details about HTML 5