Who Are You?
One common and irritating blog mistake is, simply, forgetting to tell us who you are. Yes, you already know. Your mother knows, too. Yes, you're modest. That's fine. But we don't know you, we just showed up through a link or a search engine, and we want to know who you are-- if only to be able to say 'thank you'.
Mark Boulton (thanks Anders Fagoerjord!) has a lovely home page design that combines a weblog, portfolio, and resume.