Right now, MySurvey is now accepting new applicants. It is free to join and is a great way to earn rewards for giving your opinions on new products. You just have to fill out a short form in order to join. You can then try to qualify for surveys.
If you are interested in online surveys to earn, please also check out my snack, Online Surveys to Earn Cash. I have a list of other great survey companies I have had personal success with (even Nickelodeon for those of you with wee ones)!