Thibault Imbert decided to released is book on open source license. This book is write in French, although Thibault ask for the cooperation of everyone to translate it to other languages (primarily English). I really don’t understand why O’Reilly France didn’t publish the book, but the intention of Thibault is great and should be followed by more people.
He has created a forum so you can post your comments or ideas there. Now, go there on 21st of April, download the book, and if you know French and English, pls help to translate it so other can use it too.