There has been a ton of buzz on the quality score being implemented over at Google. A WebmasterWorld thread that just got started caught my attention. Senior Member, david_uk is noticing more "scraper sites" appearing as opposed to "MFAs."
Scraper sites are sites that steal content from other sites and post them on their own site. Typically this is done robotically, made easier through RSS feeds. They tend to have a lot more content than MFAs, which were specifically designed to get people to click on ads. MFAs have less content, and more ads that appear like content. Scraper sites have more content and less ads. At least that seems to be the informal distinction between the two.
Since Google's new quality score looks at a page's landing page, and tries to figure out the content, MFAs are not doing as well these days. But david_uk says that scraper sites are now reappearing and taking their place. Google just can't win!
Forum discussion at WebmasterWorld.