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I could easily have squeezed a few more chapters into this book. I could have added a chapter about creating new file systems, or about adding new protocol stacks (as if there's a need for that -- you'd have to dig underground to find a protocol stack not supported by Linux). I could have added explanations of the kernel mechanisms we haven't touched upon, such as bootstrapping or the disk interface.
However, I chose not to. My purpose in writing this book was to provide initiation into the mysteries of kernel module programming and to teach the common techniques for that purpose. For people seriously interested in kernel programming, I recommend Juan-Mariano de Goyeneche's list of kernel resources . Also, as Linus said, the best way to learn the kernel is to read the source code yourself.
If you're interested in more examples of short kernel modules, I recommend Phrack magazine. Even if you're not interested in security, and as a programmer you should be, the kernel modules there are good examples of what you can do inside the kernel, and they're short enough not to require too much effort to understand.
I hope I have helped you in your quest to become a better programmer, or at least to have fun through technology. And, if you do write useful kernel modules, I hope you publish them under the GPL, so I can use them too.
If you'd like to contribute to this guide, please contact one the maintainers for details. As you've already seen, there's a placeholder chapter now, waiting to be filled with examples for sysfs.