My default search provider is Swagbucks. I get relevant search results, and earn rewards points while doing something I'd be doing anyway. In addition to receiving Swagbucks for everyday searches, you can also earn by completing surveys, answering polls, completing tasks, and more. There's lots of bonus swag codes to be found as well. Your Swagbucks can then be redeemed for gift cards, merchandise, charity donations, sweepstakes entries, etc.
Haven't joined Swagbucks yet? Click here to join and use the Swag Code 5THBIRTHDAY during registration - you'll start with 120 Swag Bucks instead of the usual 30. I've earned close to 4000 points from using Swagbucks so far. Once I hit 5000 I'll be cashing in for $50 Paypal cash. woo hoo!