Given that your blog has great content, it should also be presented in an organized way. Link within, smart layer are some must have widgets for the same.
Grammar - Depending on the language you use, blogging just makes it imperative that you are reasonably good with your grammar skills and proficiency if not a master. Remember your audience is a mix of both; the ones who are experts and the ones who are not.
Write for Google and no one follows, Write for People and Google follows.