As described in the Linaro kernel process available here:
https://wiki.linaro.org/WorkingGroups/KernelConsolidation/KernelTree
the 2.6.37 branch of the Linaro kernel is now open and available here:
http://git.linaro.org/gitweb?p=kernel/linux-linaro-2.6.37.git%3Ba=summary
git://git.linaro.org/kernel/linux-linaro-2.6.37.git
This is a stable core 2.6.37 kernel with the latest 2.6.38-ish ARM related patches merged in. More patches will be merged as we move ahead to the actual 2.6.38 release.
Again, if you have patches that have gone into mainline, or are on their way for mainline inclusion, you can have them merged in the Linaro tree for early exposure to a wider audience, and packaging in the Linaro distribution.
Nicolas