Changes done in each Linux kernel release. Other places to get news about the Linux kernel are [http://lwn.net/Kernel/ LWN kernel status], [http://www.h-online.com/open/features/ H-Online], or the Linux Kernel mailing list (there is a web interface in [http://www.lkml.org www.lkml.org]). List of changes of older releases can be found at LinuxVersions. If you're going to add something here look first at LinuxChangesRules!
You can discuss the latest Linux kernel changes on the [http://forum.kernelnewbies.org/list.php?4 Kernelnewbies web forum].