Crowdtap is one of them!
Crowdtap, if you haven't heard of it before, is a website dedicated to short "quick hit" surveys, trial product testing and some amazing opportunities! You give your opinions, test products, leave feedback and gain points! Those points are then turned into prizes from tee-shirts to gift cards and they're not that hard to get!
If you are interested in all that Crowdtap has to offer then click on the link below - and behold the ever expanding universe of trials, tests and surveys!! Go forth and accumulate!!