Your country: US
Reward types: Cash, gift cards and items
Incentives per survey: 0.50 to 3 US$
Cash out: from 50 US$
Number of invites: about 10 surveys in a month
Age to join: from 18 - 44 years
Comments: Never screen out at online surveys, as well political surveys that are frequently published in the media

Your country: US
Reward types: Cash
Incentives per survey: 1 to 3 US$
Cash out: from 5 US$
Number of invites: about 8 in a month
Age to join: from 15 years
Prize draws: Monthly high technical devices (e.g. iPhone, iPod or Apple TV) with a total retail value of 500 US$
Comments: Payments checks are mailed weekly

Your country: US
Reward types: Cash
Incentives per survey: 0,50 to 3 US$
Cash out: from 20 US$
Number of invites: about 15 surveys in a month
Age to join: from 18 years
Prize draws: New membership prize draw for 2,500 US$ and monthly prize draws
Comments: Get free products to test at home

Your country: US
Reward types: Gift vouchers and sweepstakes
Incentives per survey: 10 to 100 points (up to 1 US$, more loyalty points possible)
Cash out: from 500 points (5 US$)
Number of invites: about 8 surveys in a month
Age to join: from 18 years
Prize draws: New membership prize draw for 5,000 US$ and annual car prize draw (e.g. Ford Fusion) and monthly 5,000 US$ cash draw and quarterly to win 2,500 points each
Comments: Loyalty program from 5 participations in surveys, in addition extra points for frequent partaking

Your country: US
Reward types: Sweepstakes for cash only
Number of invites: regularly due to sofware use plus occasional surveys
Age to join: from 18 years
Prize draws: Monthly $ 10,000 cash for 10 winners, stay active on the panel
Comments: This is a Nielsen special panel (world's major market research institute). You need to install software, which permanently tracks what Web-sites you visit - online surveys may be conducted on internet usage accordingly.