It's called It Was the Best of Sentences, It Was the Worst of Sentences.
It teaches how to improve writing at the sentence level. I based it largely on the writing problems I see in my copy editing work. It talks about upside-down subordination, passives, weak verb choices, weak noun choices, how to pare down flabby prose, how adverbs can backfire on a writer, and more issues that make good writing go bad.
I also use real-life examples of badly written sentences (many of them by professionals) and show how to break them down into parts and rebuild them better.
Here are links on Powell's, Barnes & Noble, Amazon, Borders, and IndieBound.
It Was the Best of Sentences scored back-cover endorsements from literary agent and author extraordinaire Donald Maass (author of The Fire in Fiction), Grammar Girl Mignon Fogarty (author of Grammar Girl's Quick and Dirty Tips for Better Writing), and Elizabeth Little (author of Biting the Wax Tadpole, which, by the way, is a fascinating read for anyone interested in foreign languages).
I really hope It Was the Best of Sentences will help some struggling writers become great writers!