Short overview (for news sites, etc)
Linux 2.6.20 greatly improves kdump (http://news.zdnet.co.uk/software/0,1000000121,39285165,00.htm ); KVM (http://kvm.sourceforge.net) for Intel with VT and AMD with SVM hardware virtualization.
Important things (AKA: ''the cool stuff'')
Other stuff
Arch-independent changes in the kernel core
Architecture-specific changes
- ARM
- Support to change MX1 CPU frequency at runtime.
Filesystems
- DebugFS: inotify support
Networking
CPU Freq
- Add support for CN400 when ACPI C3 isn't available.
Drivers and other subsystems
- optimize o_direct on block devices: Implement block device specific .direct_IO method instead of going through generic direct_io_worker for block device.
- HWMon: New Winbond W83793 hardware monitoring driver