Adafruit Learning System- Over the course of a few weeks we will teach you everything you need to know to get started with the Arduino. Learn how to use your Arduino to blink an LED, control a motor, play sounds, hook up an LCD display, and much more. Check back each day for a NEW lesson!
Arduino LED Tutorial | Interfacing different types of light emitting diodes to the Arduino. CLICK HERE for Tutorial https://arduino-board.com/pages/tutorials
I have yet to see anything that could teach a child/adult how to do the most basic of things that someone with no computer skills cant do on his own that is comprehensive and follows a logical progression. I think that the idea of having teachers/geeks teach everyone is too limited. You should be able to give a child a Pi and they should be able to use videos, online tutorial and such to follow a teaching plan.