Great topic, thanks for starting it! I have been taking surveys for years and do well.
As for Pinecone they are more elite as in you can't just sign up accept for their occasional banners or sign up links if you can find them. They are not easy...well it just so happens that I have them and so I will share them. I would advise anyone wanting to join Pinecone do so quickly as they are only good for so long and for so many. Here they are:
USA
https://www.pineconeresearch.com/Signup/Signup_Form.aspUK
https://www.pineconeresearch.co.uk/Signup/S...Form_UK_new.aspCanada
https://www.pineconeresearch.ca/Signup/Signup_Form_CA.aspSorry but Germany Deutschland DE is already closed.
Adam really posted a lot of great sites, a lot of which I have been taking surveys from and paid well. I really like Mindfield as some surveys lead to better paying projects. Also many of their surveys can lead to getting to test a new product that hasn't yet come out. So you get paid and get free things. Can't beat that.
I also really like Hagen Sinclair, but they are actually discussion panels (a lot done online though) and they pay incredibly well. I just got one on insurance, where I just have to log in daily (any time I want) and answer the question of the day. This is over a couple of weeks and will only really take an hour or two of my time and the reward is $200!

Their link for anyone interested is
http://hagensinclair.com