There are 2 current models of A1 (Teron):
1.. A1 (Teron) ATX form factor.
2.. A1 mini (Teron mini) mini-ITX form factor. This features onboard graphics chip (ATI) and audio chip (CMI).
The Pegasos2 is mATX :-D
I'd love to see more mini-ITX PowerPC systems! :-D