These sites actually do let you make free money and get free stuff. i have pictures of checks and payments sent to me through paypal.
I will explain a little bit how to go about doing one of these sites. In a little bit.
The basics to most sites are you sign up either under someone by clicking on there link or by yourself if you see someone with a link they usually will pay you to do an (offer) as we in the freebie scene call it (once you go green which means you have gotten credit for doin a particualr offer).
Now to do an offer you need to make sure you follow all the rules of that particular offer. Offers range from 7 day trials for only $1 to coffee makers over $100. But if your shooting for well say a plasma tv whats a $100 right ;) and if you join a proven legit site you wont have to worry about not getting your product. If you want links to places that will help you to know if a site is legit, check down below under my banners i will list a few sites that you can check out (Grade A is really good just like in school an A is good an F is bad).
This site pays you per offer, nothing to win. You get paid on or around the 20th of every month, That is if you cash out at the end of the month. Basically cash out at the last day of any month (example Feb.) get paid around the 20th of march.