I am just reading the reports about the history of the systems on ign, are they part of the manual, too?
e.g. http://pc.ign.com/articles/380/380940p1.html
I like them because they give the story a even more immersive atmosphere, but are they just a nice prequel, or are they really consistent with the game? e.g. do you encounter the animosities between Rheinland and the GMG during the game? Do you get to no more of those eco-terrorists and Mollys?