My favourite is Bread Matters - Andrew Whitley (
info here)- only available as a physical book (hard and paper back). It's part a manifesto for real bread, part recipe book.
My two next joint favourites are Nigella Lawson's Domestic Goddess (it's no real surpise that two of my three favourites are to do with baking!) and Madhur Jaffrey's Eastern Vegetarian Cooking