I found some great tutorials on LEDs and thought I'd pass them along.
LEDs for Beginners LEDs for Beginners
LED Circuitry tutorial: how to hook up LEDs. LED Tutorial
MetkuMods - Because you love your hardware! Figure out which resistor you need
Current limiting Resistor calculator for leds Circuitry Wizard (creates circuit design for you)
Resistor Codes - Transwiki Resistor Codes
Graphical Resistance Calculator Calculate Resister Codes From Colors (identify resistors)
LEDs for Beginners LEDs for Beginners
LED Circuitry tutorial: how to hook up LEDs. LED Tutorial
MetkuMods - Because you love your hardware! Figure out which resistor you need
Current limiting Resistor calculator for leds Circuitry Wizard (creates circuit design for you)
Resistor Codes - Transwiki Resistor Codes
Graphical Resistance Calculator Calculate Resister Codes From Colors (identify resistors)
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