Over the past few months, I have gone on a spending spree on Amazon. First, I finally bought the ipod I'd been saving for, then, when my mouse broke, I broke down and bought a magic mouse. When I went on this spree, I didn't spend any of my own money. I had accumulated amazon gift cards by participating in surveys and by using swagbucks.com for my daily searching.
Every time my account reaches 450 swag bucks, I get a $5 Amazon gift card. Searching the internet is something I do anyway, every day, and their search engine gets better and better as the site develops and grows stronger. Searching is a simple way to see swag bucks add up, but the real money is in referrals. After I had a few friends join, my points went through the roof and I ended up slowly being able to afford a $150 mp3 player, $5 at a time. There are some other prizes on there, and I can't speak to their value, but I know some people will "save up" for things like an XBox (I can't imagine how many swag bucks you need for an XBox).
If you're interested, you should check it out. It's pretty exhilarating when you get your first prize, just for using the search engine, and if you're into online games, they have a pretty active twitter and facebook account where they post opportunities and contests to grab swag bucks every day. And because this post is clearly about shameless promotion: