Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online.
Sites like Demand Studios () and Associated Content () hire experienced freelance writers, editors and filmmakers to work on projects for sites like eHow, LiveStrong.com and YouTube. At Demand Studios, assignments pay anywhere from $15 to $100; if you meet tenure and activity requirements, you can be eligible for health insurance plans. At Associated Content there are three ways to earn money: Upfront payments for content you write ($2 to $15 per article), assigned articles ($10 to $100 per article) and performance payments ($1.50 for every 1,000 page views of your article if it’s posted online).