Just to throw this out there: many of those "Get a Free Whatever" promotions are actually legitimate, if you want to go through the hassle. They require, usually, that you purchase 2 or 3 items from several pages of offers. Once you've completed these transactions, you enter a waiting period, until they "come through". Then you enter another waiting period, completely arbitrary, until you are "confirmed". Then there is some paperwork. Finally, sometimes a few months later, you get the product or its near equivalent.
Plus, you're saddled with whatever you bought. The key is to buy something you'll really use (like Blockbuster online), or something that you're willing to cancel, with all of that attendant hassle: vitamin samples or weight loss patches, etc. that only cost a few dollars but enroll you in a monthly program unless you cancel within 30 days.
How do I know? I'm closely related to a person with the time and inclination to go through that hassle. The freebies thus garnered include a Sony Aquas LCD TV, a PSP, an ACER Laptop, and an IPOD 60GB.
And most of those schemes also work only if you can get a high number of people to do the same thing...
For example you must buy 3 items out of a list of 10, and then get 10 people to do the same thing before you get the "free" whatever.
Those items you have to buy are usually way overpriced to the point where you could buy them elsewhere and have enough left to buy that "free" whatever and then some, plus of course it's getting ever harder to sign up people for something like this.
Essentially they're pyramid schemes, which are illegal.