This isn't really a cross stitch BOOK, but I love the Just Cross Stitch magazine's yearly Christmas ornament issue. Many designers (I don't have an issue handy, but I would say 30, approximately) design an ornament for each year's issue. Some of the patterns are issued yearly as a series, which is nice for fans of a particular designer or design.
This issue comes out in September each year, so it should be in shops and on newsstands now. Also, I'm sure that http://www.just-crossstitch.com/ would have info.
Oops, just checked that website and it is under construction. Oh well!
If I recall correctly, doesn't the Christmas Ornament issue also include recipes from some of the designers? I subscribe to JCS. Love the magazine!