http://news.bbc.co.uk/2/hi/technology/4816520.stm
Or conversly the MacOS running on cheap Intel boxes.
Many people discussing the feat online stress that it is of more than casual interest. One of the many reasons that Apple machines have not proved more popular is because of the relatively small number of programs, in particular games, created for them. With work, many of the hugely popular programs for Windows may be able to run on Apple machines too.
Or conversly the MacOS running on cheap Intel boxes.