Here is a teaching focused talk on contract cheating I delivered for the Computer Science department at the University of Sheffield.
The slides, can be accessed on my SlideShare account, or viewed below.
There are several new and recent examples in this presentation, with less direct focus on research results. One example includes a sting operation from Local 6 News in Florida, who commissioned original work and caught the writer being paid on camera.
Some suggestions about how the Computing community can help to stop the impact of contract cheating are also provided. I believe that there is certainly scope for technical approaches for detection to be developed, but that sensible methods of setting assignments should also be considered.