Kodu is a free program that allows users to create games using a really intuitive system that is visual making it great for kids. This lends itself brilliantly to the world of programming and should be very useful for future teaching when the new curriculum is finally announced.
Have a look at this introductory video to see the sorts of things you can get up to. I’ve used this with my class and they really enjoyed using it. The fact it’s free means they can download it and continue learning at home and even save their projects to show in school.
You can download Kodu for free here: http://fuse.microsoft.com/page/kodu