As written in my personal blog I'm running Debian on my ppc efika board already. Now I've a first, working grml-kernel for ppc:
# uname -a
Linux grmlppc 2.6.19-grml #2 PREEMPT Sat Jan 20 20:26:15 CET 2007 ppc GNU/Linux
Now I can really start working on grml-ppc on my own. The plan is to have grml64 and grml-ppc available with release of grml 1.0.
Currently I'm crosscompiling the kernel on x86. It works but it would be nice to have a more powerful compile system, especially another (native) ppc system would be fine....