One question that I see asked a lot online and am always interested in myself is what Amazon MTurk alternatives are there on the web? It is always good to have other options to fall back on, or other methods of earning online to use in addition to Amazon Mechanical Turk. As far as I am aware, there are no websites like MTurk that resemble it in every way, but there are places that have some of the Amazon MTurk features and where you can make money online.
Microworkers has the most obvious similarities of all the MTurk alternatives. The website has a different layout, there are less jobs on off than MTurk, you get your earnings paid into a PayPal account rather than through Amazon, they use some different terms for things such as jobs instead of hits, but the essentials are pretty much the same: you do online tasks and you are paid money in return. Out of all the websites like MTurk it is the most similar. I have written numerous articles, comparisons and reviews of Microworkers, such as Microworkers Tips, The Pros and Cons of Making Money with Microworkers, MTurk or Microworkers, which is best?.
Inbox Dollars advertises itself as an online rewards club. Many of the tasks are the same sort of thing that can be found on Amazon Mturk: watching videos, completing surveys, applying for things. They pay you by check, so you receive real money, but you have to cross a $30 threshold. That isn’t too difficult as they give you a $5 start, which is useful. I have also written a full Review of Inbox Dollars which you are welcome to read.
Shorttask.com has been recommended to me. I have not had time to join and take a detailed enough look around it in order to write a review, but on the surface it looks fairly similar to Microworkers.
The other two websites that I’ve used regularly are Swagbucks, another online rewards club not too dissimilar to Inbox Dollars and Mylot, which is a form of social network site in the same vein as Facebook, except you get paid for commenting and posting photos etc.
There are websites that focus entirely on surveys. Out of these, Pine Cone Research is possibly rated the most highly. They are always full and you need a referral from someone who is already a member to join, however. My wife is a member. They pay at least $3 per survey which is good. Often you have an initial survey that pays $3, then they send you a product in the post, for example, a new fizzy drink. You try the product then do a second $3 survey telling them what you thought of the drink.
UPDATE (February 2014)
If I was writing this article now, I would definitely say that Bubblews was the best alternative, certainly if you just want to earn some (relatively) quick and easy money. You write short (minimum 400 characters) articles with freedom to choose your topic and interact with other writers, rather like you would do in Facebook, and earn for this. The payment threshold was raised to $50 recently which means that it can take a week to get a payout, but it's easy and it's fun.