So the old IDE hard drive is really the last upgradable bottleneck in my trusty 12" G4. I tried a 7200 rpm drive back in the day but didn't have much improvement over a larger capacity 5400. Basically half the theoretical IDE speed. SO after watching some prices on ebay, I found a 1.8" sata is actually really reasonably priced. Way better prices than the PATA drives like legacy pro or kingston, transcend, etc. And the smaller drive means you can fit a SATA->PATA converter (link) in the drive bay just the same. I just ordered everything for this setup today (total cost was $70 for 128gb and adapter) and I'll follow up on speed improvement. Thought others with trusty old PPC laptops might like to see there's a new option for getting that last little bit of performance from the machine.