Welcome to the PowerPup!
Update 07-19-2012: Wow, it's been 3 years since I last did anything huh? Well it looks like I'm going to be too busy this Summer as well. In all honesty I'm not sure when I'll get back to PowerPup, I currently don't use Linux enough in my daily life to obtain the neccessary skill to create my own distro.
For those still looking for something, I highly reccomend Lubuntu 12.04, (or anything using LXDE.) Lubuntu's Alternate Install CD for PPC was easy to use, automatically installed yaboot and everything. And after booting to the desktop it was only using about 160MB of RAM. Which is great for Macs with small amounts of RAM.
I may work on PowerPup again, though I really don't know if they'll be a need for it by then. We'll see I guess.