Have you heard of Swagbucks? Swagbucks is a search engine that combines the best of google, ask and various websites into one search engine that allows you to earn swagbucks which you can exchange for prizes. I usually just get the Amazon.com giftcards (I am a book nerd, after all!) but they offer a great selection of prizes, contests and other ways to earn Swag!
Click on the image below and sign up!