Google Takes Steps to Reward High-quality Website Writing and Linking
Google's Matt Cutts: high-quality website writing and linking will be rewarded. Spamming and scamming will be slamming.
Google Algorithm Changes: What You May Not Know
Since its inception, Google has implemented a number of algorithm changes to enhance the user experience and deliver the most relevant search engine results available on the web. Google engineers have long championed the mantra, “build a better tool and they will come.” Depending on how a site is optimized, shifting winds emanating from The Googleplex can foreshadow an impending beat-down in rankings or signal vindication for online marketers playing by the rules.