Overview
For a small fee, you gain access to a database of hundreds of research companies who will pay you for your opinions.  The upfront fee can be recovered with as little as the first survey you take, although you have to be persistent.

Best Suited For
This is an opportunity for stay-at-home parents, students, entrepreneurs, retirees - anyone who needs a flexible source of extra income and enjoys using the Internet.  These online surveys can typically be done no matter where in the world you live, although most of them are in English.

Considerations
Online survey jobs do require effort and persistence as not all the survey companies will select every individual to participate.  It's a numbers game - the more you complete, the more you can make.  Many people do paid online surveys for part time extra income, while others do it full time.

Realistic Income Earning Potential
As much as $99 but more typically $5-$50 per survey depending on the company, the individual, and each type of survey or focus group.  Increasingly some companies are offering prizes or points toward prizes instead of cash for online surveys.