The FC4/PPC build of Livna packages is now available again at ftp://ftp.uk.linux.org/pub/linux/fedora-ppc/fc4-livna/. Livna is essentially the "Fedora Extras" for the Free World, with packages like xine, mplayer, MP3 plugins, etc.

To add it to your yum configuration, download the livna.repo file and save it in the /etc/yum.repos.d directory.