See AmigaOS4 in action on video.
If you don't have quicktime6 the .mp4 files are the ones most likely to work. If your browser can't handle that page you might try
this one instead.
This is AmigaOS4 running on the 933MHz G4 AmigaONE. Speed will be better in a short time then some stuff is replaced with native/JIT-emulated code.
http://hagge.no-ip.org/personal/computers/amiga/