Swag Codes are a great way to earn easy Swag Bucks every day. Each day, the Swag Bucks site releases a random code that is worth different amounts of Swag Bucks. They are usually hidden around the site, such as in the blog, the Swag Store, or Swag Bucks' Twitter or Facebook pages.
All you have to do is find the code, paste it in the "Enter your Swag Code" box on the home page, and click "Gimme". Your easy Swag Bucks will be applied.
The only hard part is finding them and entering before they expire. There are some sites out there devoted to notifying people when Swag Codes are released. It is against the rules to flat out tell a person a Swag Code, but you can give them hints on where to find them. My favorite site is Swagcode Spoiler. I get an email notification every time swag Codes are released. I also try to notify my referrals when Swag Codes are out so they can benefit too. I don't get any Swag Bucks for Swag Codes, I just do this to keep my referrals happy. :)
