BuzzBack usually send out one survey every month, however, I don’t qualify very often. Their surveys are usually interesting and easy to do, and compensation usually are cash.
I have done a couple of surveys for them, payments are $5 – $10. It does took a while to receive the payment check though, so one has to be patient with them I guess.
Update December 2011:
I have not received any surveys from BuzzBack for a long time, and I tried to login but was told my account doesn’t exist. Anyway, I have deleted Buzzback from my survey list.