So, I took advantage of the extended weekend to replace the old 6GB travelstar in my powerbook with a brand new 40GB 5400 rpm drive. Planning ahead, I had already purchased a firewire laptop drive enclosure, negating the need to backup data. Thinking it would be the cat's pajamas, I endeavoured to make a debian CD with jigdo. This was a pointless act, as although it results in an up-to-date CD, it is not bootable on PowerPC (And maybe not on x86, either). But, in the meantime I found http://www.phy.olemiss.edu/debian-cd which offeres a wide variety of bootable, business-card size debian install CDs. Using this and a debian mirror or two, sucessfully installed, save for its use of KDE as the default desktop.
Incidentally, installing linux on powerpc (at least NewWorld macs) has greatly improved since I first got this thing.