Hello,
This is my first post to this forum. I am one of the developer of the small Kid Operating System (http://kos.enix.org).
I just wanted to point out the fact that I and an other developer of KOS, David Decotigny, have started to write articles concerning OS development. They explain how to build your own 32-bits, multitasked OS for x86 from scratch. There will be at least 10 or 11 articles. They are only available in French, published in the french "Linux Magazine France".
The first article has been published in the issue 62 (http://www.linuxmag-france.org/produit.php?produit=175), still available for sell in all good bookshops. The second article will be available in issue 63.
The articles should also be available online later. We are thinking of a traduction for these articles.
More informations are available on the SOS Website : http://sos.enix.org. SOS is the small OS that is built step by step in the articles.