QuestionPro - Research Access Forums

Here is a comprehensive list of many legitimate, free, paying
survey sites. I personally use all of these and get paid!
By paying - I mean cash, paypal, gift certificates and prizes.
NOT sweepstakes and entries into drawings. I feel like those
are a waste of time since your chances of winning are so small
that you are basically doing surveys for free. You won't get
rich by taking surveys, but you can make a nice little bit of
extra money every month to help you out! They are fun too
and it's nice to know that companies really want your input
and are listening to you!

http://pages.suddenlink.net/legit-paid-surveys

This is quite an interesting compilation of some paying survey sites. Indeed paid survey sites are becoming highly popular now days.

Online Surveys