I've spent the last couple of weeks playing around with MacOS on a Pippin. The results were mixed -- System 7.5.5 runs happily and I would be able to run an old web server such as MacHTTP 2.2 if I had the space to set it up somewhere -- but it would have been nice to get a minimal Linux installation running. A full report on the successful bits can be found at http://www.mandrake.demon.co.uk/Apple/pip1.html.
I still have many questions remaining:
What is the video controller on Pippins? The page above includes a TattleTech report describing the system.
Does anyone have any Pippin developer resources -- documentation or software -- that I could borrow? Is the old Apple Pippin site mirrored anywhere?