[wladimir]

It looks like the kernelnewbies.org page is getting stampeded and is unreachable. Too bad, they usually have a nice high-level overview of the new kernel features and changes.

[edwintorok]

The H also has an overview, but I usually prefer KernelNewbies too: http://www.h-online.com/open/features/What-s-new-in-Linux-3-...

[wazoox]

If you can read french, http://linuxfr.org/news/sortie-du-noyau-linux-3-9 is a good overview.

[iso8859-1]

It's up now: http://kernelnewbies.org/LinuxChanges