I've only spoken to people in America about it, but the schemes over there seem to work. I've spoken to 4 people who got the referrals and they all got their iPod.
From what I've heard though, getting the referrals isn't too easy. It's been stuff like needing to get 9 people to take out a 3 month minimum subscription with AOL amoungst other things. If you can get people to do that (willingly, without forcing them and making sure they know what they're doing...) then great
I'm not sure it's fair for other people to post their referral links in this thread though...