Of the options which appealed to me, only Fedora and Debian had official PowerPC support. I ended up going with Debian.
Read it here
Yes, Debian had a rather colossal screwup with SSL recently, and yes, it is not as exciting as its progeny Ubuntu. However, one of the things I really appreciate about Debian is its outspoken support for Free Software. Add that to a system that does everything I need (word processing, web, email, games, amateur radio, chat, etc.), and I am in heaven.