I have one that's just for motivation too. I get most of my advice from author blogs because I'm cheap but this book was worth it: the National Novel Writing Month book written by the creator, No Plot? No Problem! by Chris Baty. I just adore NaNo because it's what got me into writing and the whole sense of complete literary abandonment really works for me, so this book is great for motivating me.

I feel like I should read Bird by Bird at some point because it's talked about so much.