Well it's not quite a book. It's a website that lets you use your Gmail account in a book-like way. I'm a programmer. Which is akin to being an author, I suppose. I have a Kindle 3G and I find trying to use my Gmail account on the 'experimental' web browser, even on the mobile site I find it almost impossible. Just too small small, to much gray and too hard to see. I wanted black and white, big fonts...something like reading a book.
So I put in some serious time and wrote this webapp and put this out there for all to see and use. The webpage has all the info and I hope you find it valuable. And yes, I admit, I'm asking for $9.95 for unlimited use for a year. I wanted an email experience that was book-like for my Kindle (can be used on any web browser equipped ereader), so I priced it like a book.
http://www.inkimail.com