Pureprofile
This is my favourite survey website and the one I make the most money from ($10-15 a month). What I like about the site is that you earn real cash, not just points which you exchange for cash. If you qualify for a survey you can earn between 50c and $5, and even if you don’t qualify you usually receive 10c. You can also earn 10c from clicking through to a website or watching a video. Once you have made $25, you can request a direct deposit to your bank account, which usually takes 2-3 weeks.
Pureprofile is open to anyone worldwide. However, if you’re in Australia and want to join, it would be great if you could send me your email address so I can send you a referral link, which will mean I get $2 for referring you. Although if that’s too hard, just sign up. I’m happy to endorse them for free.
RewardsCentral
On this site you earn points for doing surveys, which you can then exchange for cash (3300 points for $30 or 10100 points for $100). Each survey gives you between 100 and 500 points, and if you don’t qualify for the survey, you are given two entries into their competition to win $10000 (although after 10 years I still haven’t won yet!). They also send you emails, which give you 10 points to click through to a site. I usually make about $60 a year from this site and MyOpinions combined (see below).
MyOpinions 
Back when I first signed up, RewardsCentral and MyOpinions were both part of a site called Emailcash, For some reason Emailcash split into two different sites, which now both do a pretty similar thing. MyOpinions is purely a survey site, where you earn between 50 and 500 points for completing surveys. You then have to transfer those points to RewardsCentral to redeem them for cash. Similarly, if you don’t qualify for a survey you earn entries in their $500 cash competition.
One thing that they do do differently is that you have a loyalty status, which means you earn extra points for each survey. For example I have platinum status, so earn a bonus of 7.5% more points every time I complete a survey.
Swagbucks
 I am a newcomer to Swagbucks this year, but I have found quite a bit to like and have already made $10 in Amazon vouchers. Basically you can earn Swagbucks (points) by doing web searches, answering surveys or referring other people. I usually make around 7-50 Swagbucks a day from searches and more from doing surveys.The best part about Swagbucks is their referral program.
The Swagbucks can then be exchanged for Amazon gift vouchers ($5 for 500 Swagbucks), Paypal vouchers ($25 for 2500 Swagbucks) and a lot more. Because of the huge Amazon postage costs to Australia, but if you live in the US, Amazon gift cards are a great choice.
Your Voice 
This is another site that I only started using recently and have liked so far. They have just revamped their website, and it’s looking a lot more professional. It’s similar to the other survey sites in that you complete surveys for points (between 15 and 50 per survey). You can then redeem these points for vouchers from a number of different stores like Kmart, Target, Myer or JBHifi. 200 points gets you a $20 voucher.
They will also send the vouchers by email, so you can use them on the day you redeem them.