Another good survey site to join is GlobalTestMarket. Here, surveys you take will earn you points. Most surveys are worth 50 points, and some can be 100 points. You only need 1000 points to cash out! Their conversion rate is much higher than other sites: 1000 points is worth $50! They payout by check.
The good thing about this site is that you get a bit of points even if you don't qualify for a survey.
Here are some proof pictures of checks received from GlobalTestMarket:
Click here to sign up!