I have the answer
I gave my 12 yo daughter a Raspberry pi that I had set up and now she can't let go. Deliberately I haven't connected it to the net yet but with MIT Scratch alone it's keeping her occupied for hours and hours. The XBOX 360, Wii and the PSP were a complete waste of money compared to that cheap little box. The good thing about the Raspberry pi is that you can just wipe it and start over every now and again.