The Google job opportunity page has a job listing for a Quality Rater. The job description calls for a "part-time remote workers to help with search quality evaluation." There are those that believe this job is to better find and de-list sites that are found not to comply Quality Guidelines. Basically, the job title to an SEO is "Spam Reporter". Side note: wonder if many bloggers link to this as Spam Reporter, we can get a little Google bomb going. :)
There are two threads discussing this topic, one at Search Engine Watch Forums and the other at Cre8asite Forums.