The Economist's author style guide is full of great writing advice (though the writing style, ironically, might put you off). I particularly enjoyed this passage:
"Do not be too didactic. If too many sentences begin Compare, Consider, Expect,Imagine, Look at, Note, Prepare for, Remember or Take, readers will think they are reading a textbook (or, indeed, a style book). This may not be the way to persuade them to renew their subscriptions."
Essentially: keep your sentences short, avoid clichés and jargon, and favour clarity.
If it's good enough for the Economist, chances are, it's good enough for your blog.