Ed - watch out on that "art" business. It is a dark side of turning that can actually lead to not having much fun with it anymore.
It seems a while back that many have forgotten the beautiful simplicity of nice clean lines of a turned piece, or the functionality of good wooden bowl.
I like a little decoration, but the pieces I see now that are airbrushed, stippled, woodburned, painted, toned, carved, and on and on.... well, they leave me a little cold. There have two or three times the amount of time decorating the wood than they did turning it. In many cases, the wood no longer even looks like wood.
That's fine, and certainly if someone wants to pursue woodturning in that fashion, more power to them!
I liked a lot of that stuff initially, but at this point I really don't care for the "art" aspects of turning unless it is making the most out of a fine piece of wood.
There are several books out there that do a good job on describing different turning procedures and ideas. I don't think any of them is "the" book. If I were you, I would buy a couple of standards (Fred's book is a great place to start) and go to the library and the half priced book store in your area and look to see what particular styles you are interested in developing.
This can give you a leg up on the shapes and designs you are interested in turning, as well as stretching your $$$. Hey... turning books are expensive!!
Not all "art" is "art". And while I have no doubt that many of the turnings that I see that are acclaimed as artful masterpieces are beyond my turning abilities, I wouldn't want to learn to make them myself.
As always, just my 0.02.
Robert