If you have just a few minutes, you could spend it filling out online surveys. There are multiple sites that will pay you to do so and it’s very easy. All you have to do is register, and start filling answering questions. Typically these are online market research surveys for big brands. Some companies even pay you just for installing an app or playing a game!
Amazon Mechanical Turk: If you don't mind doing menial microtasks, you can sign up as a worker of Amazon's Mechanical Turk service. Although payout for each is low, there are thousands of tasks to choose from - text translations, copy editing, image verification, etc. These are usually tasks that machines can't pull off competently and still require human judgment.
What a huge, great list of ideas – bookmarked this as I know I’ll be coming back to go over it again and again. Here’s another item that could have made the list. I found a financial directory that’s useful for info on making money online. It’s http://money.madbeetech.com. What I like about it is that each directory listing includes ebooks and videos that can be instantly downloaded. All sorts of stuff for people who have their own website, and people who don’t (but still want to make money online).
The music industry might not be as strong as it was in the 80s, but there are still plenty of ways to make money online as a musician. Sites like SoundBetter let you sell your services as a songwriter, producer, or session musician to thousands of customers a month. While Musicbed, Music Vine, Marmoset, and SongFreedom are perfect for licensing your music to TV shows, movies, and web series.
If you’ve got experience and expertise in a specific area of business, there are hundreds if not thousands of business owners who would love to jump on a phone call and pick your brain. This can be an easy way to make extra money online and to hone your skills to use in your consulting or freelance business. Sites like Clarity.fm let you create a profile where entrepreneurs and business owners can pre-pay to book a phone call with you for a set amount of time. Whether you’re an expert in raising money for startups, building apps, or running a restaurant, you can make extra money selling a few minutes of your time to people in need.