English for free

I keep on working on a digital textbook for Bachillerato in Spain. The name will be "English for free". I hope it can be used in other countries as well. The idea is to have digital materials under a Creative Commons licence. Students would have a digital copy of the book and teachers could use the book in the classroom with a multimedia projector or a digital whiteboard. I hope the first unit will be finished by the end of the month and the next two by the end of September, and the whole book by Christmas. If anyone is interested, please let me know at jgarciateacher@hotmail.com.