make htmldocs
Documentation/kernel-docs.txt
Other kernel docs
kernelnewbies
kerneltrap
Linux Weekly News
Kernel Hackers Docs
TODO
Other sources of information:
http://foldoc.doc.ic.ac.uk
the Dictionary of Algorithms, Data Structures, and Problems
the Memory Management Glossary
The Jargon File http://www.tuxedo.org/~esr/jargon/ or http://www.jargon.org/