I've been using Amazon Mechanical Turk for two months now, and started making money with it on the first day. I wish I could add an image, I'd post a screen shot of my account showing actual earnings being paid out. You can choose to be paid through your bank account, or in gift certificates usable for Amazon purchases. I'm mostly using it for pocket change, and buying myself books and fun things through Amazon I couldn't otherwise afford. I'mnot trying to make a living from it, but I've earned about $150 in my PJ's.
The jobs, called "hits" come from many sources. They may involve categorizing images, surveys, writing reviews or articles, transcribing audio files, and viewing o testing websites. The lowest hit I've taken was two cents, and the highest paying was $10.25. It adds up, if you do it right. This takes some experimentation to figure out.
It's easy to sign up and start. You may gt frustrated because you have to separate the good hits from the ones that really aren't worth anyone's time. Amazon brokers the employee/client relationship, but unless it is a request from them directly they're not really responsible for the offers. When deciding to take an individual hit or not, you should real the request and any agreements carefully.
There is actual money to be made on Am Turk, however there are also providers that post work I would look at as a little shady. For instance, I'd avoid high paying surveys that promise only a few questions and then lead you to "offers" you must complete. However, some of the surveys offered by educational institutions and businesses are quite legit. Over time, by playing with it and submitting hits, you'll be able to see which kinds of hits work best for you.
Incidentally, I'm not an affiliate of Am Turk- as in, I don't make any money by telling the readers here about it. I'm affiliated with them only in the sense that I have taken work through them and received payment. I'm just reviewing it because I think some folks out there may find it to be useful information.
One thing it has been useful in is helping me find more opportunities to do freelance writing. A lot of the writing gigs posted on there don't pay much, but occasionally some of them can lead to other work. Do however read carefully what kind of licencing you're accepting when you submit written work, and be aware that some of the providers are very cool, and others have less than good intentions.
Be careful to pay attention to the time allotted for various jobs. Some give you only a few minutes, while others give you days to complete the work. If you 'abandon' too many hits by accepting them and not completing them, you will qualify for less jobs. On the other hand, there are sometimes better paying hits offered. Some of them you may have to take qualifications tests to be able to accept. Most of what you can do with it is very much up to you. As a way to make a little bit of money in your spare time, it's great!