Hello Mirek,
Probably it is better that we contribute in some chapters of general books about snowboarding, instead of making a book exclusively about extremecarving. Don't forget that Jacques and I have been racers in the past, and that for 25-28 years we are also soft boots riders and freeriders. Extremecarving is one way of riding, not a religion, though the basics (rotation, push-pull, setup, etc.) make it a discipline by itself now and apply to other disciplines. Strangely some people imagine that we only do EC. It's probably because we developed this technique and focused on it with Extremecarving.com, pictures and videos. The other disciplines (racing, freeriding, etc.) were already well documented and known by the public.
Actually we have already contributed to some chapters in two books:
1) The Fundamentals of Snowboard
Carving and Racing
A Manual for Surfers, Coaches & Parents
by Marc A. Cirigliano
Copyright © 2007 by Marc A. Cirigliano
Rochester, NY

I have chapter 6 in PDF format, but I don't know if Marc would accept that I place it over Internet.
2) In preparation: a big French book about snowboarding, gear, techniques, pedagogy, etc.
by Pierre Régnier
Coming soon (in 1-2 years), France
Besides this there are other contributions over Internet. A famous one is the text in the Carver's Almanac:
http://www.alpinecarving.com/ec.html
Special thanks to our friends in Canada and USA who helped us in writing the articles. Our English is bad and it's not easy to explain everything as we do in French.
With more time we would make more things for sure.
We observe that organizing events makes people progress more than if we write theory and books.
Patrice Fivat