I have had many iBook G4's in the past. Unfortunately I was in the fix and sell business at the time, and I wasn't as interested in collecting. I should have kept at least one or two of them. I also have owned various other machines, but today the only PPC Mac I own is my PowerMac G4 Quicksilver 2001. This is subject to change though, as I may get the chance at a FW800 MDD soon!
All PPC Macs I own or have owned:
-PowerMac G4 Quicksilver, 867MHZ, 1.5GB RAM, 250GB HD
-PowerMac G4 Sawtooth, 400MHZ, 512MB RAM, 250GB HD
-PowerMac G4 MDD, Single 1.0GHZ, 768MB RAM, 80GB HD
-iBook G3 Clamshell SE, 366MHZ, 512MB RAM, 40GB HD
-iBook G3 Clamshell SE, 466MHZ, 512MB RAM, 40GB HD
-2x iBook G4 12", 1.2GHZ, 768MB RAM, 80GB HD
-PowerBook G4 12", 1.0GHZ, 1.25GB RAM, 40GB HD
-PowerBook G4 15", 667MHZ, 256MB, 30GB HD
*PowerMac G5 Early-2004, 2.0GHZ DP, 2GB RAM, 320GB HD* (I repaired this one for a friends father's business, so I never actually owned it

)
So thats all so far. Hopefully my list continues to grow!