First off, the site I'm about to link is not a scam unless you mess up.
If you pay attention, you can get a free 4GB iPod Mini without shelling out any money.(Remember, you have to pay attention and read to avoide paying out $$)
Here's the website to check out: http://www.freeipods.com
Now, the trick is to sign up and refer 5 people to their site(they also have to complete offers) and you can get a free iPod
I have researched this thoroughly, it is not a scam as long as you're smart about it.
All I ask is that you click my referral link when/if you sign up: http://www.freeipods.com/default.aspx?referer=7679815
Warning: You need a credit card to complete the offers, but it is needed only to confirm that you are not trying to scam freeipods.com, it is only to confirm identity.
You will not be billed if you cancel the offers early
FreeiPods FAQ: http://www.freeipods.com/Faqs.aspx
Note: Your best bet is to sign up for AOL or Netscape, wait about 3days until you get the credit for completion on freeipods.com, then cancel it.
If you cancel prior to the 30 or 50 day limit, you will not be billed.
You can probably pull off something similar with the BMG/ColumbiaHouse offers
You can also look at this thread: Skill-Club FreeiPod thread for more info and comments