A first release of the Pegasos book is now available at the title link.
I recall that the original version of the Pegasos Book ("Le livre du Pegasos"), is a free document of 148 pages in PDF format in french language.
Its goal is to gather a whole of information and articles on the Pegasos and its operating systems (MorphOS, Linux, MacOSX with MacOnLinux) in only one document which can be consulted off line or printed easily.
This first release in english does not include the MacOSX and a half of Linux part.
Note that you can now make donations to help translators and authors for updates on the ebook's page.
Translations in other languages are still in progress (german, spanish, italian, portugese, swedish and polish).