Mturk

Amazon's mechanical turk provides companies with small computer related tasks to outsource their tasks to a large labor pool of individuals willing to do it for pennies. People can fill out surveys for research purposes. They can give their opinion of which is a better GUI design. They can tag websites. It's basically for companies that need feedback or remedial tasks completed. People can earn money through this website, but it's usually less than minimum wage. For people that don't value their time it is a great way to supplement their income.