Never mess your blog with too much of Adsense ads. It gives a confusing look to the blog.
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 straight from your Heart...Write for a Cause and Not for an Applause!!