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Windell writes –

This morning someone asked me if it was possible to program AVR microcontrollers using their Arduino board as a programmer. I looked, and sure enough, a solution exists! This could be pretty handy, particularly if you have a Mac and/or only USB ports. Someone that is going to make this will probably also want to take a look at Atmel application note 42, which discusses using the ISP (in-system programmable) interface (PDF)…

tinker.it » » Turn Arduino into an AVR-ISP programmer – Link