A new Linaro Toolchain mailing-list was just created.
This list will serve Linaro development, discussions, and planning around the usual bits: GCC, Binutils, GNU C Library / EGLIBC, and GDB bits -- but the list of tools is very open, so LLVM, Valgrind or QEMU are fine topics too!
(Discussions around upstream patches or new upstream features should still be preferably done on the respective upstream mailing-lists.)
Once they see the new list, I bet the folks from the Linaro Toolchain Working Group will be rushing to subscribe. ;-)
You can subscribe from: http://lists.linaro.org/mailman/listinfo/linaro-toolchain
Read you there!