More useful links:
[http://lkml.org lkml.org] linux-kernel mailing list
[http://kernel.org kernel.org] the home of the Linux kernel
[http://linux-news.net] linux distro news.
The following sites have regular updates relevant to the Linux Kernel.
[http://www.lwn.net Linux Weekly News] - follow the kernel link (changes weekly) (the current kernel page is always http://lwn.net/current/kernel.php3).
[http://kerneltraffic.org Kernel Traffic] - a digest of what was discussed on the Linux-kernel mailing list
[http://www.kerneltrap.org/ Kerneltrap] - news on various free OS kernels