I agree with Aum that Google NGrams could be a "fun and easy to use" tool in the classroom -- perhaps it can give students some insights about how language changes over time. But I don't think that it is a very appropriate tool for use in research, unless it's just a starting point, as Aum said. Has anyone found a paper that uses Google n-grams as their primary data source? I'd be interested to read it.
Just as another example that is not mentioned in the linked article is the chart that you see when you go to
https://books.google.com/ngrams now. It shows that "Frankenstein" has gained in popularity since 1960, easily outpacing "Albert Einstein" and "Sherlock Holmes". But chances are, the books are not referring to the famous Frankenstein story, but instead the new definition of this word meaning of "a monstrous creation; especially: a work or agency that ruins its originator" (from Merriam-Webster Dictionary). But there is nothing in the data that would show this. You would only find it by looking at concordance lines.
And by the way, I would also be interested in reading Steve's blog. What is the URL?