The Blood Red Pencil recently had a good entry about editing blog posts. There's a traditional school of thought that, once the blog publishes, it lives as is - correct or riddled with errors. I completely disagree, and the reasons mentioned here are valid. Be sure to read the dozen or so comments for how other writers feel about the subject.
Now go read through your own blog posts for the past week, correct any grammatical errors, and while you're at it, check the flow of your posts from day-to-day. Bottoms up, of course.