LED resistor calculator

[Circuitbenders]

http://led.linear1.org/1led.wiz

handy calculator that lets you know the value of the resistor required to run an LED from any voltage source

[computer at sea]

I can't remember if I allready posted this on another thread, so pardon me if I have.

This link is handy if you're  making an array of LEDs for any reason:

http://led.linear1.org/led.wiz