Arduino and Electronics
How to read Resistors: How to read resistor codes.
Resistor calculator: A tools for calculating resistors values based on their colours.
Making a led blink using arduino: here
Arduino Language Reference: A reference manual for the arduino programming language
The arduino tutorials:Tutorials for making and programming simple circuits using an arduino.
Tom Igoe’s Physical Computing Site: Heaps of information on basic electronics along with sensors, acuators and microcontrollers.
Spooky Arduino projects and tutorials: Another class taught using arduino with good examples and tutorials.
The Electronics Club: Components: A good place to go to find out what a component is and how to use it.