A new Knoppix Live CD for PowerPC called Niktarix has been announced here:

Niktarix announcement

An early version is available as an ISO for download here:

Niktarix ISO

Niktarix has been built using kernel 2.6.11, binaries mostly from Debian Sarge, and KDE 3.3.2 as a desktop.

At the moment, the author has tested his work just on Genesi/PowerPC, i.o.w., not yet on a Macintosh or any other PPC platform.

Regards,

Walter.