Linux kernel development
kernelnewbies.org the main kernelnewbies website
Linux From Scratch detailed instructions on how to build your own Linux system entirely from source code
Linux From Scratch - Essential Pre-Reading more help for Linux From Scratch
KernelWiki (appears to be broken at the moment)
LinuxMM Linux memory management wiki
http://linux-mm.org/HugePages Huge pages wiki
http://linuxfs.pbwiki.com/ Filesystems wiki
Linux-Net Linux networking wiki
lkml.org linux-kernel mailing list
kernel.org the home of the Linux kernel
kernel.org/doc various documentation around the kernel
http://linux-news.net linux distro news.
General Linux
gNewSense a distro based on Ubuntu with all the non-free parts removed
Security related
Linux Security detailed Linux security news site
News sites
Linux Weekly News - follow the kernel link (changes weekly) (the current kernel page is always http://lwn.net/current/kernel.php3).
Kerneltrap - news on various free OS kernels
Kernel Traffic (link to Internet Archive) - a digest of what was discussed on the Linux-kernel mailing list (original site has disappeared)
