Well, I just turned 18 today and also got the ACD today as well - I am in Mac nirvana!
And before anyone brings it up...
I am 18 and work at a pizza restaurant as well as do some freelance web design on the side. I paid for everything myself from money that I earned, including the software (Adobe Creative Suite, Macromedia, etc.), RAM, the iPod, etc. and the Powerbook. My parents paid for the ACD, but they had promised me a long time ago if I got a scholarship to college they would by me a computer and 23 inch ACD....I just got into UGA with a HOPE scholarship and they decided to let me have the ACD early so I wouldn't have to squint on the 12 inch PB screen while working on my graphics projects.