I quite don't understand the appeal. If you want a PPC laptop, just buy an iBook G4, they sell for $30 on eBay…
It's barely usable for web browsing. Even with upgraded hardware (1.25GB RAM and a CF card instead of hard drive) Firefox on Ubuntu and TenFourFox on Mac OS X Tiger are really damn slow. OWB (WebKit) on MorphOS is a bit better, but still not what I'd use for everyday work.
After trying a whole load of options, Lubuntu 14.04 was the best but there wasn’t anything which provided a modern web experience.
I briefly thought of trying to make a Raspberry Pi casemod with it before realising how hard it would be - seemed a shame to get rid of a perfectly good screen and enclosure just because the processor is no longer supported.