Bird By Bird
Bird by Bird - Anne Lamott
Many successful authors call Bird by Bird the best book on better writing ever written. I loved reading the book. While it leans towards how to better fiction, I think there is plenty for non-fiction writers to take away, especially as it relates to the life and habits of writers.
The main point is that you shouldn't obsess over getting published and just enjoy the process of writing because becoming published is not all that it's cracked out to be but the writing life is if you truly enjoy it.
Lamott is a great writer and will have you laughing and crying with this book. While writers will appreciate the book the most, it's so well written that I think everyone can find something of value in it.