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Column by Jon Gingerich January 31, 2012

(...) Below are 20 common grammar mistakes I see routinely, not only in editorial queries and submissions, but in print: in HR manuals, blogs, magazines, newspapers, trade journals, and even best selling novels. If it makes you feel any better, I’ve made each of these mistakes a hundred times, and I know some of the best authors in history have lived to see these very toadstools appear in print. Let's hope you can learn from some of their more famous mistakes. are 20 common grammar mistakes.

To read more (with a lot of comments):
http://litreactor.com/columns/20-common-grammar-mistakes-that-almost-everyone-gets-wrong