One of my all time favorite books on writing is the fittingly-titled On Writing by Stephen King. It is subtitled A Memoir of the Craft, which is fitting, because the book is heavy on memoir and light on writing tips. That's not a bad thing, though.
King takes us on an autobiographical journey, beginning with his early childhood. We learn about life experiences that informed or impacted his development as a writer and his journey to publication.
Along the way, he shares his philosophies on writing, and there are lessons to be gleaned, both explicitly and inductively. Some of his perspectives, such as the notion that stories are "found objects" that the writer unearths from her/his subconscious, are not universally agreed-upon, and might not work for everyone, but they're interesting nonetheless. The actual "writing advice" section is more for beginners, but still useful for a writer at any level.
I'm a fan of the audiobook, which King narrates, but On Writing is available in print and ebook if you aren't an audio junkie like me.
Buy On Writing from the Google Bookstore.