A while back I reviewed a book called Nancy's Theory of Style (Review) and I pretty much loved this book! The author Marta Acosta (pen-name Grace Coopersmith) recently emailed about something awesome - You can read the draft for this book online! FOR FREE! It "can read it at the Scribd site, download it onto their computers, or download it to e-readers and mobile devices."
Here's the link: http://www.scribd.com/doc/37115908/Nancy-s-Theory-Draft
Yes, it has typos but it's totally free and since I loved this book, you might too!