Documentation - Text files in the kernel source tarball's Documentation subdirectory.
htmldocs - Kernel Documentation maintained in docbook format (output of "make htmldocs").
Menuconfig - help text for each kernel configuration option (from kconfig source).
README various README files scattered around Linux kernel source
RFC - List of IETF RFCs referred to by kernel source files. Links to both the text of the RFC and the source files that refer to it.
LP64 standard defining the size of char, short, int, and long on 32-bit and 64-bit platforms. (See also the rationale for the standard, and the legacy reasons another OS declined to adopt this standard).
Linux Foundation's specs page (ELF, Dwarf, ABI...)
RSA Animate - The surprising truth about what motivates us
All Linux Weekly News kernel articles indexed by topic
Linux kernel changelog (summary of what's new in each version)
H-Online's Kernel-Log (most recent first)
Understanding the Linux Virtual Memory Manager, online book by Mel Gorman.
Page maintained by Rob Landley, rob at landley dot net.