Fancy trying the OpenJDK PPC port? Support is now available for using its HotSpot repository in place of the IcedTea one when building IcedTea 2.x:

$ hg clone http://icedtea.classpath.org/hg/icedtea7/
$ cd icedtea7
$ ./autogen.sh
$ ./configure --with-hotspot-build=ppc
$ make

Enjoy!

Update: The PPC port has now been merged into the main IcedTea HotSpot repository, so the --with-hotspot-build option is no longer needed.