Personally, I find twitter fun and useful for many reasons, some of which have nothing to do with blog promotion. It’s a social networking site, which means that its core purpose is connecting people with other people. If all you want is to promote yourself and/or your blog, if you’re not really interested in the other people, they’ll figure that out quickly and ignore you.
But there’s nothing wrong with letting your fellow tweeps know what you’re blogging about, and twitter is a great platform for reaching readers who otherwise might not find you. So read Mr. Everson’s post, and add all or some of his suggestions to your twitter strategy.