The current development kernel is 2.6.31-rc8, released on August 27.
"This should be the last -rc, and it's really been quieting
down. There's 131 commits there, and it's all pretty trivial." He
predicts the final 2.6.31 release will happen on Labor Day
There have been no stable updates in the last week, and none are in the
review process as of this writing.