Craigslist has been used for all sorts of questionable things. Probably not topping the list, but still highly objectionable, it has been used to recruit people to grade high-stakes standardized exams. It has been used in Dallas by Pearson for the all-important STAAR test. It has been used recently by kellyservices, a company specializing in outsourcing and consulting, in Indianapolis to solicit standardized-test scorers. All you basically need is a bachelor's degree, ID, time on your hands and one of those God-given rubrics.
I'm sure it's only a matter of time before underpaid workers, lacking benefits, operating out of dangerous warehouses abroad, are hired to grade standardized U.S. exams. Perhaps they can be internationally recruited via a global version of Craigslist.
In the meantime, here's a possible ad. for Craig's List.