Did you know that English speakers are in high demand in Asia? As a result many are turning to freelance English teachers using websites like Italki.com. The site is basically a virtual online classroom for freelance teachers and students. Anyone can offer lessons (and set their own price), and anyone can take lessons. From a quick scan, it looks like making $15 to 20/hour is a fair expectation.
Fiverr: Israeli-based Fivver was started in 2010 by Shal Wininger and Micha Kaufam. It's a great resource for selling just about any service online. You can offer gigs as low as $5 but also get paid much more for upgrades and add-ons. There are plenty of providers earning 6 figures on Fiverr so it's definitely a worthwhile cause for generating a healthy income. Just ensure that you provide some serious value.
Diligence. In this industry, the line between scams and honest businesses is blurry, so you need to do your homework before accepting a position. Call the Better Business Bureau in your area to find out if there have been any complaints filed against the company, and do an online search on their name. Alpine Access is a well-respected company in the field, and Call Center Careers is a great place to look for legitimate call centers looking to hire.