I second the recommendation for Peter Reinhart's Artisan Breads Every Day, for a straight-up bread book.
If you're willing to consider a cookbook that goes beyond just yeasted breads, you might consider one of Ken Haedrich's books. I love his Soup Makes the Meal, which has menus that each have a soup, bread, and salad. (I like it enough that I'm in the process of indexing it now!) "Bread" in this case includes muffins, scones, soda breads, flatbreads, yeasted breads, and more. The bread recipes are all very approachable and good. I also like The Harvest Baker, which has all kinds of baked goods, sweet and savory, that incorporate fruit or vegetables in some way.