There are a number of sites across the web that tell you how much retailers want your opinion and how many thousands of dollars they will pay you for it. Those sites make me giggle.
The one company that I do surveys from is Global Test Markets. Over the past few years, I've made almost $700 from them and have not been particularly active. Most surveys pay between $1.75 (35 points, with each point worth a nickel) and $10 and take anywhere from 5-20 minutes. I usually qualify for every third survey or so and, if you don't qualify, they usually tell you pretty quickly, so you don't waste too much time (Do you hear me, e-rewards?).
You won't get rich quickly. You won't even get rich slowly. But it's nice to build up a mileage run fund.
Disclosure, as always: If you join and confirm your email address through the link below, I may get a token something or other, so it's always appreciated.