You earn points by completing surveys and then redeem the points for prizes, including Amazon e-certificates. When you combine your Amazon e-certificates from Lightspeed Research with the ones you got from normal everyday web searches on Swagbucks you'll find your Amazon account balance increasing every week!
Some of the other surveys companies already reviewed on this blog are Global Test Market, Survey Savvy, SayNation, Valued Opinions, American Consumer Opinion, Opinion Outpost , Zoompanel, Ipsos I-Say, HCD Surveys, and university-sponsored sites. Have you signed up for all of them?