A few days ago, I commited the PowerMacintosh port to the 
NetBSD-current.

It runs on (at least) PowerMac 7300, 8600, 9500, and 9600.

* Supported devices:
  on-board 53c9x SCSI, mace ethernet, zs, ADB keyboard and mouse
  PCI card: ne2000 compatible ethernet, 3c905 ethernet

* Devices NOT supported:
  on-board mesh SCSI, floppy disk, audio, ...

* Currently NetBSD/macppc uses linuxppc's milo for primary boot,
  but it is not included in source tree because of GPL.
  (I must rewrite it shortly)

for other information, please see http://nandra.iri.co.jp/NetBSD/macppc.html