Mturk is a way to make some cash on a semi-consistent basis when work with ZC or whoever isn't available. Usually the pay rate isn't great even on a good day (I wouldn't expect over $6/hour unless you get some good work) but making a few bucks here and there adds up over the course of a month! Also it's through Amazon, though it's technically contractor work. But at least it's backed by a legitimate company.
I honestly can't remember how to sign up on the site since it was years ago, but here's a link to the main page: www.mturk.com/mturk/welcome
Basically the way it works is you accept Hits offered by requesters on the site, and you get paid upon completion. The work ranges from rating search results for accuracy to doing surveys that can pay $10+ for one survey. Getting work depends mostly on luck and being ready to accept tasks within a second or two of them appearing. Here are a few tools to help with this: