Swagbucks is one of the very best survey sites out there today.
InboxDollars has a great mix of surveys available, offering many different types of surveys and other earning opportunities within the site. You do need to qualify for the surveys, and there is a survey pre-screener you must complete to make sure that you are part of the target audience.
MyPoints is a survey site best known for its shopping offers while also offering tons of survey earning opportunities. Most surveys pay 30 to 500 points, and you can redeem your points for gift cards to Amazon, Best Buy, Target, and other popular merchants.