I have an older G4 eMac with 512Mb RAM. I upgraded the CD-Rom to a DVD burner and am installing Feisty on it. I did however run into issues just getting to the install.
Read it in this blog
The desktop appeared and I began a typical graphical install. (make sure to select the Macintosh keyboard during setup if you are using one like I am).
This how to was a combination of 4 how-tos I found in the Ubuntu PPC forums.
These are the setting that worked for me. Id like to thank ZoiaGuyver for all of the work he put into the forums getting people like me straightened out.