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: Gift vouchers
Incentives per survey: $2 to $5 (and up to 50 US$ for specialist surveys)
Cash out: from $20
Number of invites: about 12 surveys in a month
Age to join: from 16 years
Prize draws: New member prize draw for electronics (e.g. iPod touch)

Your country: US
Reward types: gift cards and cash via prepaid card from VISA
Per survey: 1 to 3 US$
Cash out: from 25 US$ (2,500 points)
Number of invites: about 10 surveys in a month
Age to join: from 13 years
Comments: Prepaid card from VISA are sent by post, but you can also request a virtual gift card

Your country: US
Reward types: Cash and gift cards
Incentives per survey: 1 to 3 US$
Cash out: from 10 US$ (1,000 points)
Number of invites: about 10 surveys in a month
Age to join: from 13 years
Comments: 100 points for completion of the personal profile information and loyalty program for completing surveys consecutively receive users more extra points

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.