I have a vast assortment of grammar and writing books in my personal library. Every morning I read a chapter from two or three at a time. After reading them, I post a review on my blog. I hope other writers find these reviews helpful. Here are five books I've just finished reading.
Writing Tools by Roy Peter Clark is divided up into (naturally) 50 chapters that each deal with a specific topic on writing. The chapters are short and include exercises in order to practice what you learned.