What seems like many moons ago, when I first started browsing the World Wide Web, I was a member of several survey sites. Some I've let go by the wayside due to lack of interest or lack of rewards, but one that I've kept up with is ZoomPanel.
ZoomPanel is a survey site that's simple to join and easy to earn rewards. By joining, emails will be sent to you and you will have the opportunity to tell companies what you think. Membership is free and you will receive points for each survey you take. After you have earned enough points, you can turn them into rewards for music, electronics, and more. I'm always anxious to spend my points, so I often get books for the kids as soon as I have enough. If you'd like to receive rewards just for giving your opinion, I'd recommend signing up with ZoomPanel.
I received no compensation for this post, but it does include a referral link. Please do your own research before using services. Your opinions and results may differ from mine.