I used to do a LOT of survey sites - sometimes for points sometimes for cash sometimes for gift cards.
The site I like the best though is the site that gives you points for shopping and for just reading your e-mails - it's called MyPoints. I get 10-15 e-mails every day and I click on a button that opens up a new browser to whatever the e-mail is selling. I usually click it and then close the browser cause I'm rarely interested. But I get 5 points per e-mail.
And then you get points by shopping vendors that are registered with MP - like Target, Floral Delivery sites, Overstock.com, etc. I've racked up over 30,000 points in the last year or two and gotten a bunch of gift cards (you redeem your points) like Starbucks, Shell gasoline, Target, etc. I love it! I'm going to shop anyway so I might as well get some extra stuff.
The survey sites I used to frequent are
Survey Spot,
Global Test Market, and I think one that's called
Greenfield Online. They're reputable and I've earned some money in cash checks (we're talking $20-$50 over 2 years, nothing major). The fun thing is doing tests on new products. I've tried out air fresheners and shampoo - I loved the shampoo! LOL
If anyone wants to help me earn points and wants to sign up for My Points I can send you an invitation but I need your e-mail.
You can get points from referring friends.