Kernel release status
The current stable 2.6 kernel is 2.6.19.1, released on December 11.
It contains quite a few fixes, including two for security-related problems.
There have been no 2.6 prepatches over the last week as the 2.6.20 merge window is still open. Quite a few patches have found their way into the mainline git repository; see below for a summary.
The current -mm tree is 2.6.19-mm1. Recent changes to -mm include new debugging features for kmap_atomic(), the user-space driver framework, and a public-key transport mechanism for eCryptfs. Mostly, however, -mm has shrunk considerably as patches have moved into the mainline.
For older 2.6 kernels: Adrian Bunk has released 2.6.16.35 with a few dozen fixes
(one security-related). He has also released 2.6.16.36-rc1 with a handful of
patches.