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I think that there is some confusion about Linux on PPC. The majority of systems using LinuxPPC are IBM System P and System i. Linux runs on the same hardware as AIX and Linux on Power has been pushed for a while. SLES and RHEL will not drop support for PPC. However, many of the above posters are correct that Linux for PPC does not make sense for a desktop distro like Ubuntu, Fedora, and OpenSuse. Those were intended for Macs which are very different than System P.
You do not typically hear about System P outside of AIX communities, but there is a very large install base in the fortune 500 space.
Linux on Macs = dead
Linux on System P = very much alive and well.