I've been a member of this forum for some time, and although I've rarely posted, I do read a lot of the messages, and have read a number of ski books over the last year and a half.
I very much enjoyed Ron LeMasters book, The Skier's Edge. Quoting from the preface, "This is not a how-to-ski book-- it is a book about how skiing works. It is about the fundamental principles and techniques at work in skiing and how good skiers apply them. Most avid skiers are, in effect, their own coaches... I hope to convey to these skiers a coherent, fundamental understanding of skiing from the snow up; one through which they can evaluate and expand their own skiing."
It was a fascinating read, I sped through it on the afternoon the UPS guy delivered it.
I also enjoyed Bob Barnes book, The Complete Encyclopedia of Sking, very much. It seems to provide a common source for much of the terminology used by some of the most insightful and helpful of the posters on this site.
I have read through each of these two twice, (both for simple enjoyment/daydreaming during the summer, and for learning/applying things on the snow), and have looked things up in one or the other many times.
Finally, I am on my second read-through of Harald Harb's book, Anyone can be an Expert Skier. It is more of a lesson plan than either of the other two books, and is therefore not quite as fun a read. However, I will spend some time working on this skiing progression myself this winter. I also understand that it is the best selling of the current ski books, so it
presents some terminology and methods that you may hear and see on the slopes; Also, it is the the first version of the "holy book" espoused by one side in some of the most stem winding, mud slingin, knock-em-down flame wars you'll see on this site.