Have an extra room in the house? Try renting it out on Airbnb.com. According to Smart Asset, you can pay up to 81% of your rent by listing one room in a two-bedroom home. If you're really looking to ring in the cash, renting out a private home or apartment is the way to go. According to Smart Asset's findings, rates for full apartments are significantly higher than those for just rooms, with annual profits ranging from $15,000 to $31,000 for a two-bedroom apartment.
Companies will pay you to virtually sit on mock juries to give attorneys and other jury consultants feedback on cases they are currently handling. Think of these as focus groups. The cases are real, but your verdict will do little more than give those involved a prediction of how things might go when it's time to go to court. You can earn fees ranging from $5 to $60. Be sure to read all the disclaimers and details. If this sounds interesting go to eJury.com or OnlineVerdict.com to find a case.
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.