Amusingly, a twenty-ish techy type at my wife's employer --- a retail bank --- started talking about the benefits of open source to a somewhat bemused audience of risk managers today. My wife decided that was not the moment to point out that when said techy was busy being born RMS was sleeping in our spare room.

The Solaris port to PPC was completed and released: 2.5.1 was available in little-endian form for PReP platforms. I don't have any running (or indeed runnable) 2.5.1 machines to hand, but the manual pages were full of references. Some engineering continued into 2.6, and I think there are references in the manual pages for that as well. You can read the story at http://opensolaris.org/os/project/ppc-dev/