BigDevil

http://www.bigdevil.com/
BigDevil is a search engine where members can win prizes just for searching the web. Prizes include iPod, Xbox 360, gift card, Paypal cash and more. Members can search 30 to 50 times a day for a chance to win instant prizes.
Members can also win points for searching, inviting friends, and playing games. The points count as entries into BigDevil’s monthly sweepstakes for chances to win bigger prizes. You must be 13 or older & from the United States, United Kingdom or Canada to join.

Winzy

http://www.winzy.com/pcmm
Search with Winzy for a chance to win various prizes, such as Amazon.com Gift Certificates, iTunes Gift Certificates, Apple iPods, Nintendo Wii and Xbox 360. Also, earn points for searching & referring friends, which count as entries into the monthly Winzy Sweepstakes. The current grand prize is $100,000.
Referring friends also increases your chances of winning. If they search and win, you win the same prize. To register, you must be 13 or older and live in the United States or Canada (except Quebec).

Every Click

http://www.everyclick.com/
Search with Everyclick and earn money for the charity of your choice. Everyclick donates half of its revenue to charities.

Search Cactus

http://www.searchcactus.com/
Earn $0.01 for making a search and visiting a website (up to 15 per day). You can also earn money by completing offers. New members get $3 credited into their account. The minimum payout is $20. U.S. & Canada Only.

GoodSearch

GoodSearch is a Yahoo-powered search engine that shares 50% of its revenue with charities or schools. Earn an estimate of $0.01 each time you search and donate total revenue to the nonprofit organization of your choice.

SearchChips

http://www.searchchips.com/
Earn a chance to win a gift certificate or movie ticket per search (up to 20 per day). Also, earn chips (points) for doing various activities including referring friends, logging in, bookmarking pages, completing offers and more. The chips can then be exchanged for rewards.