Amazon Mechanical Turk is a mass-micro outsourcing API, where you can get lots\'s of small simple tasks (e.g.\"Is there a shop in this image\") done relatively cheaply (e.g. 0.1
The problem you have is that to actually be able to add funds to your account, you need to have a US billing address. If you can get round that issue, then it all works fine.
Since Amazon doesn't let outside US access yet, you'll need to either:
You may want to take a look at TurkPrime labs which offers this as a service to non-US based researchers.
I think they recently changed their rules - I am based in Australia, and as recently as 6 months ago I was unable to use Mechanical Turk. That recently changed and now I am able to post jobs on the service.