YourSay.com

Tried out this site for online surveys. My review as follows:

Good
- Membership is free
- No spams so far
- Surveys are customized to Singapore context
- Easy money - got paid $3 for doing a simple, less than 10-min survey online

Bad
- Takes a long time to process payment - received payment for a survey done in May only in August
- Surveys are few and hard to come by, received only about 1 -2 surveys per month
- Quota for participants is low, so if you are slow in responding, you don't get to do the survey
- Payment is not by check. have to give personal information such as bank account numbers

You can register as a member here. By the way, I DO NOT get anything by referrals.