When you see stuff like this for the Arduino you realise just how good something like this could be if you could run it on a mobile device. I know that there’s Amarino for Android but it does require you to get yourself a bluetooth module to connect.
Modkit is very reminiscent of scratch and also Google’s App Inventor site too. I’m all in favour of these kind of programming interfaces. Not only does it make it easier for anyone to tinker around, but it is great for kids too.