It was recently announced that Demon’s Souls was finally making its way to PAL territories and that it would be arriving in a fancy box, complete with the soundtrack, art book and strategy guide. Namco were keen to point out that these were not just the leftovers of the other releases and were in fact completely new. So new, in fact, that the strategy guide is completely different and has been written by fans rather than professional writers.
Not just any fans mind you; the guide has been written by Matthew Whisker and Wayne Gibson, who run the Demon’s Souls Wiki. Namco Bandai contacted them and requested they write the game because their Wiki is the best place for information on the game. They obviously accepted and the deal means they do it free of charge but people who buy the game get a free strategy guide.
This deal keeps all parties happy really. Namco are able to produce the guide for basically nothing, the Demon’s Souls community gets credit for their work and gamers get a free guide!
Source: Demon’s Souls Wiki