Another move in the SEO wars... and perhaps a knock against eHow and so forth.
Google has updated their algorithm (which they do all the time) - this time, coming out and saying that they're targeting low-quality content farms, splogs, etc.:
“This update is designed to reduce rankings for low-quality sites — sites which are low-value add for users, copy content from other Web sites or sites that are just not very useful,” Amit Singhal, a Google fellow, and Matt Cutts, who leads Google’s spam-fighting team, wrote in a company blog post. “At the same time, it will provide better rankings for high-quality sites — sites with original content and information such as research, in-depth reports, thoughtful analysis and so on.”