MyPoints is one of the better free to join online rewards program that lets you earn points for daily internet activities like searching the web, shopping, taking surveys, and playing online games.
The accrued points can be redeemed for free gift cards, online certificates, gas rewards cards, travel, dining, and many more rewards.

From personal experience, the points it gives out is lower than some of the other reward sites. However, they offer free points for clicking on email letters they send out. Thus it is one of the few programs where you can earn a gift card without actually purchase anything.