I use ArcMap and Adobe Illustrator and feel that both products have matured to the point that if you can dream it you can do it with these tool kits.
I have pretty wild dreams
I'm an Illustrator user myself and I still run into limitations every now and then (not counting the usual "out of memory" stuff). I don't think a specific Illustrator for Cartographers book would be that necessary. A good Illustrator book should cover those topics anyway (as cartographers we don't really use that much of what Illustrator can do, we only push it to its limits).
In fact, whenever I do a MAPublisher training course, I suggest that the participants get themselves thoroughly acquainted with Illustrator first, either through a training course or through practice.