I remember when I entered one of those 'shoot the ninja and you win an iPod' gimmicks. I never did get my iPod. I completed my offers, and I got a couple referrals. But you need 5 referrals, and you'd be surprised how hard it is to get 5, no matter how many friends you have!
Anyhow, this new website iPodSweepstakes.com doesn't seem to have the same long referral process for 'earning' and iPod, it appears that you just basically earn points by completing offers/surveys, and requesting free information from companies. It's worth a shot anyhow.
Here's the link to Get a Free iPod from iPodSweepstakes.com Now