Pegasos: A PPC mainboard that is designed to run MorphOS, along with several other OS's. This can be compared to the AmigaONE hardware, and it often is. It is rumored that there may be an OS4 kit for Pegasos, but it may have been part of flamebait. Irregardless, in the forums here, Pegasos is tied to the "Great OS4 MorphOS Debate." I wish I had more solid ground for this, but, sadly, I do not. I do believe AROS is being ported (Which is another Amiga-ish OS, which I have to investigate more myself).
MorphOS... Oh yeah, mentioning either OS4 or MorphOS here is almost asking for a flame war. It seems as if the two (AmigaOS / MorphOS) are diametrically opposed. MorphOS is very difficult to explain, in that it is a new OS but also a reimplementation of the AmigaOS. The most blatent difference between the two (other than who is flaming whom) is that MorphOS has integrated MUI rather than ClassAct (classact is now called reaction, fyi).
The best place for information on the Pegasos is
PegasosPPC.
And for MorphOS:
www.morphos.net.
NewRevolution: Please check out the various websites before spending too much time reading the flames that are bound to happen.
(Equel opportunity time here: more info on OS4 is at
os.amiga.com.)