Kernel release status
The current 2.6 prepatch remains 2.6.12-rc4. Linus has returned from his vacation and has merged about 150 patches into his git repository; these patches consist almost exclusively of security fixes, architecture updates, and various other important fixes.
The current -mm tree is 2.6.12-rc4-mm2. Recent additions to -mm include the IPSec tree, some KProbes work, the fork connector patch (for process accounting), a DVB update, an ALSA update, a NUMA-aware slab allocator, and more fixes. Note that there is now a mailing list for people who would like to be notified when patches are added to -mm; see the 2.6.12-rc4-mm2 introduction for subscription information.
The current 2.4 prepatch is 2.4.31-pre2, which was released by Marcelo on May 12. It
contains a fix for the ELF core dump vulnerability and a small number of
other patches.