Remembered a few more.
Self-Editing for Fiction Writers by Renni Browne and Dave King. Written by two editors, this should be your first port of call when you come to edit/revise your novel. Very useful.
Is There A Book In You? by Alison Baverstock. I recently re-read the part relating to the publishing business. Contains lots of quotes from industry professionals as well as an analysis of your own commitment to being a full time author.
The First Five Pages by Noah Lukeman. Written by a literary agent, this makes the point that hooking the reader is the author's first priority. And it's true. What's the point in writing the next War And Peace if no one ever reads it? But his advice pertains to your whole manuscript, not just the start. Read it before you submit your manuscript to anyone.