Pandaresearch.com

http://www.pandaresearch.com/index.jsp They say "will pay to paypal in increments of $100" Seams to pay for surveys but are very advertiser driven I get mail from pandareserch.com, this is typical of what I get from them "We have received your registration for participating in our Market Research Surveys. We are inviting participants to fill out the following surveys and offers. Please follow the link to fill out these registrations." "As a participant, you will be paid $ 53.0 for full completed Surveys and Offers in your PandaResearch account. Did you notice the phrase "full completed Surveys and Offers", well the word Offers means you get get to choose which company you will spend money with in order to get some money back, if you get the drift. For instance this is one of the links in my email they ask me to click New York Times : Begin Survey... $ 20 http://www.pandaresearch.com/cp/mailProcessor.jsp?offerid=479&pandaresearchsid=.. ... I get seven yes or no questions and a submit button. So after I click seven of the radio inputs and click Submit this is what I get!

New York Times To be eligible for the New York Times offer you need to follow the following steps 1)Complete this survey. 2)Apply for the New York Times Offer. 3)Get paid $20 in your panda research account. To Continue please press the button below.

So based on this limited investigation I do not recomend Panda Research.
They make money by skimming off purchases you/we make and with affiliate clicks they send to their clients. That's the way it seams to me. If they do not like what I say they can sue me.