A new one I haven't tried:
We are excited to offer you a free membership to our exclusive panel.
Valued Opinions is a service which rewards you for taking part in market research surveys. Receive up to $5 for each survey you complete, and up to $50 for completed specialist surveys.
This survey company is now recruiting panelists for its paid survey panels. They pay in reward points that can be converted to vouchers. Plus they're paying up to $50 for a survey completion. Sign up is free.
Enjoy! I hope you get in.
The Survey Doctor