This is a great little survey website that you can earn a few dollars each month from. Go here to get started with Opinion Outpost.
One website I use to earn free gift certificates is swagbucks. Used as a search engine you can earn virtual dollars (randomnly) that you can redeem for some really neat prizes. Check it out here...
MySurvey is a great site for taking short surveys and earning money. I LOVE this site and generally earn between $10-$20 a month for an hour or two of my time.(Just click on the logo below to get started)
There are many survey sites that allow you to earn money or gift certificates just for completing surveys for them. I have found the following sites to be user friendly and legitimate.
Earn money for clicking through or responding to emails at inbox dollars.
Another survey site in which you can earn points and redeem them for prizes.
Cashcrate is a website where you can earn money for viewing and choosing different surveys to complete.
Another legitimate survey site.