IdeaShifters Smartphone Panel is looking for smart phone users to give feedback and get rewarded! I just signed up and would love some feedback if anyone has used them before. Note: the surveys can be taken on your phone or computer 
Here is some information from their FAQ page:
IdeaShifters™ a US only panel is a division of Paradigm Sample, Inc., a market research firm that specializes in general consumer, mobile, business-to-business, and IT industries. Our clients (developers, designers, builders, analysts) want to know what consumers think about a wide variety of topics that will affect design and development decisions. IdeaShifters collects the research data through surveys and reports the results in aggregate. No individual participant is ever identifiable in the reported data.
Your participation is always 100% voluntary, and all the information you provide to us will remain confidential. Each time you complete one of our surveys, you’ll receive reward points.
You earn points for every survey you complete. The number of points per survey varies based on time necessary to complete it, the audience being requested, and the survey’s complexity. A completed survey averages 20 points. Ten points is equivalent to $1 value. The minimum amount you may redeem is 100 points.
How long do I have to respond to a survey invitation? Some surveys are open indefinitely so that all new program members have the opportunity to respond. Some surveys are available for a specific period of time, such as three to five days. The length of time varies depending on how many respondents we need, qualifications of respondents, and how quickly other members respond.
How long are the surveys? Each survey is different. Some are very short and take only 5 minutes, while others are longer and take up to 25 minutes. We’ll tell you in the invitation how long we think it will take to complete the survey. We realize that your time is valuable, so for longer surveys we aim to offer greater rewards.
It sure sounds like it’s worth a try!