Please introduce this site to any intelligent, self-disciplined 12 year olds you may know.
Take a look at http://yourduino.com which is my latest effort, still very incomplete compared to what I have in mind. Maybe we can collaborate somehow on this.
If you're starting Arduino with either Breadboards and components, or Electronic Bricks, you might try:http://arduino-info.wikispaces.com/StarterSetMenu
Many 12 year olds I know will look at it, decide there's no pictures and go watch some funny youtube videos instead.