I recently discovered the blog of book editor and critic Pat Holt. Someone I trust mentioned the blog in passing.
I wandered around the site a bit and found a post that I think is worth reading. Titled "The Ten Mistakes," the post is about common errors that writers make.
Holt touches on the three most common pieces of advice for writers: (1) Show, don't tell; (2) Information dumps masquerading in the guise of "As you know, Bob" dialogue, and (3) Empty adverbs (ly) words. But she also has other recommendations writers should think about.
Go here to read the post.