There are loads of PowerPC development boards out there, but I have yet to really se any good reason why one is better than an ARM or MISP development board, even a regular x86 board.
The Pi is like $35, for a quad-core CPU and a gig of RAM. It's going to be more flexible and have more resources than the cheapest PPC dev kits (the linked model is $225 for a dual-core CPU and 512 megs of RAM) and a lot cheaper than the more flexible dev kits.
There are more desktop/server focused boards available, but I guess the question is at that point, why bother with PowerPC at all? More people will benefit from and be able to contribute to a project centered around a $35 Pi than around a more expensive system, and the Pi will still outgun most PPC Macs.
The Pi is like $35, for a quad-core CPU and a gig of RAM. It's going to be more flexible and have more resources than the cheapest PPC dev kits (the linked model is $225 for a dual-core CPU and 512 megs of RAM) and a lot cheaper than the more flexible dev kits.
There are more desktop/server focused boards available, but I guess the question is at that point, why bother with PowerPC at all? More people will benefit from and be able to contribute to a project centered around a $35 Pi than around a more expensive system, and the Pi will still outgun most PPC Macs.