There's a lot of speculation about the information that Google has about domain names. What does Google know about your domain name and what do they not know?

Many webmasters are still obsessed with the green PageRank bar in Google's toolbar. Matt Cutts is a Google engineer who knows exactly how the Google ranking algorithm works. He confirmed that PageRank is not the only important factor for Google.

The effect of co-citation is often overlooked by search engine optimizers. The other web sites to which your link partners link can influence your search engine rankings. Read on to learn more about this important topic.

Yahoo has file a new patent with the name "Link based spam detection". It's another attempt from Yahoo to improve the relevancy of their search results by detecting links from link farms and other shady link sources. Read on to find out how this affects your web site.

Google has extended the penalty notification experiment that was started last year. Google's Webspam team now works with the Google Sitemaps team to alert some (but not all) site owners of penalties for their site.