A bit later than expected, Linus has released the final 2.6.27 kernel. For those just tuning in, 2.6.27 includes (among many other things) UBIFS, support for integrity checking in the block layer, multiqueue networking, the ftrace tracing framework, the lockless page cache, the relocation of a lot of firmware, the GSPCA webcam driver set, and a number of extended system calls. See the always-excellent KernelNewbies summary for lots more information about this release.