"Life isn't a support system for art. It's the other way around."
--Stephen King, from On Writing
On Writing is the best book I've ever read about writing—but please don't interpret my poor writing skills as a strike against it. If I hadn't read On Writing I'd be even worse.
My favorite thing about the book is King's demystification of the artistic process, manifested in practical advice such as "2nd draft = 1st draft minus 20%." He makes writing seem fun, which is the way it should be. And he uses curse words every now and then, which I like.