While I was on my quest for free games and gift cards I stumbled upon Tremor Games!!! Tremor Games is a site where you can earn "Tremor Tokens" to unlock games, Steam inventory items (did someone say TF2 hats? Crate Keys?), and even Steam Gift Card codes.
It's as simple as playing games on Tremor Games in your free time!
Now, you could go and just play games, but honestly it takes quite a bit of time to save up for a bigger item you want to get, so I suggest doing the offers on the offer pages. Tremor Games has one of the best offerwalls I have seen on similar sites. It uses a lot of sponsors, therefore giving you more options on the surveys you can take! (Personally I suggest using the Crowdflower, PeanutLabs, and RadiumOne offers for the highest payouts.)
What are you waiting for? Get your free gaming stuff at Tremor Games!