Really interesting article on nytimes.com about Google's fight against content farming:
These prose-widgets are not hammered out by robots, surprisingly. But they are written by writers who work like robots. As recent accounts of life in these words-are-money mills make clear, some content-farm writers have deadlines as frequently as every 25 minutes. Others are expected to turn around reported pieces, containing interviews with several experts, in an hour. Some compose, edit, format and publish 10 articles in a single shift. Many with decades of experience in journalism work 70-hour weeks for salaries of $40,000 with no vacation time. The content farms have taken journalism hackwork to a whole new level. [...] Mr. Miller’s job, as he made clear in an article last week in The Faster Times, an online newspaper, was to cram together words that someone’s research had suggested might be in demand on Google, position these strings as titles and headlines, embellish them with other inoffensive words and make the whole confection vaguely resemble an article.
Apparently Google has been tweaking their algorithm to filter out crap from content farms. Good for them. They've been fighting back on a couple different spam-content fronts, as seen in this Coding Horror blog post from earlier this year.