By far the best survey site I've come across is Pinecone Research which pays $5.00 a survey and does so quickly. Surveys only take about 15 minutes to complete and often times you are given a chance to try trail products. Even better, they provide surveys on a consistent basis...I usually get 2 or 3 a month. Unfortunately, they don't have a direct link to sign up with their program...they advertise on various sites (they advertised on our previous site for a short time) and rotate their banner ads around quite a bit. You need to come across one of their banner advertisements for a chance to sign up with them.
Here are some other survey sites that may be worth checking out:
SurveySavvy: The "JOIN" button is directly above the "Welcome to SurveySavvy.com."