Just my personal opinion, no disrespect intended. I have personally authored posts that needed a bit more time on the proofreading table and I did worry that people would question my authority on the subject due to grammatical errors in the article.
Just to be clear, I don't want to give the impression that I don't think spelling/grammar matter (even for blog posts). I just think it is easy to get so pedantic about it that you place far too much weight on them.
I have my own set of pet peeves, and am probably guilty of allowing the violation of one of them to taint my view of an article too quickly and too often.
And of course, there are always those articles that are so bad grammatically that it looks like a first-grader wrote them (but I don't think that's the kind of article we were discussing).
