I just joined Scour today. Scour offer you 3 search engine, google, yahoo and MSN. You earn points for searching, commenting,
voting, referring, etc. Those points can then be redeemed for visa gift cards (50000 points per $5). Looking at the points system, it will take quite a while before you ever get enough points for a gift card. It seems really hard to get the gift card, but someone really get it.