Are you looking for recipes, or decorating ideas/instructions and construction tips?
The books you mention are two good ones. In terms of basic construction techniques, you might also want to check out Wilton's books and website - at least it can get you started.
Other suggestions: Toba Garrett's books have lots of techniques in them. Elisa Strauss of Confetti Cakes has a new book out - I paged through it at the bookstore and it had some nice designs (can't speak to the instructional/construction info, I didn't have time to read it all

). Colette Peters has several books, but those are going to have more complex construction methods (lots of decorating ideas, though).
Hope that helps, and gfron is right - the wisdom of eGulleteers is an excellent resource!