Hello,
PPC means: SAM (native), will try Efika too (native)
Mac could only be supported through Linux (AROS hosted - this is not my piece of cake) I have some G3 and G4 Ibooks - will try to make an hosted Image as soon the version for SAM is ready. I will talk on the upcoming Event in Germany to A-EON, maybe we find a solution to bring this(or AROS in general) to the X1000 too.
Broadway supports all what a nightly supports. I have no time and ressources to try this, but i'm open for hints if it does. It's all comunity driven, feel free to participate ; )
The ATI HD series is not supported by the Nouveau 2D driver (yet) but you can use the VESA modes. The next Revision of the AresOne will use an onboard HD4xxx, and as i now there will a dedicated driver follow.