Swagbucks increases the amount of times they offer bucks for their searches as well as the likelihood that you will earn one of the larger amounts.
For any of you that don't know what Swagbucks is it's a website that pays you 'Swagbucks' for performing web-searches. Once you accumulate 450 Swagbucks you can swap then for a $5 Amazon gift card! Read more about them here or click here to sign up. Swagbucks is currently giving every new account 50 free bucks!