Slashdot | Next G5 Multitasks Operating Systems... now this is an interesting approach from IBM. They have traditionally always had the best inherent architecture - stemming from their mainframe days. Their iSeries or eSeries or whatever already does better (more efficient, cooler, more failsafe) multiprocessing than anything else out there in the mainstream. So why not leverage this robustness onto one chip...?
Oh, and one interesting quote from the comments under the article: The developer prototype for the next-gen XboX is an Apple G5 running a heavily-updated Windows NT:PPC, they're already in the wild. This may be why MS bought Connectix, makers of VirtualPC. Could this really be true??