When I was in 6th grade I found Ladyada's website, that really annoying one with the white dots you had to click, and saw her newest project, minty mp3. I was really impressed and thought I would never be able to design circuits that well. It was already my goal to be an electrical engineer. Then a year or two later Andrew released his book "Hacking the Xbox", I read that in one sitting. Really awesome work. I was just floored by the confidence to go to all that work setting up a bus tap like that to extract the initialization code.
Anyway, these two have been people I've been envious of at times and inspirational figures at others. A little random, but I thought I would share.