Minor (and probably not intentional) thing I like - comments are loaded manually rather than by default on page load. For more popular blogs/sites that have comments on posts like Slate Star Codex or Less Wrong, there can be literally hundreds or thousands of comments on a single post. This makes scrolling through the post or judging the amount of content in the post via scroll bar basically impossible, but just loading comments with a button click fixes that in such a simple way.