As we've discussed in many of the classes, a lot of firms and content providers try to game the search engines by creating huge webs of links back to sites via blogs, comments and so on. As we've also discussed numerous times, Google is wise to these tactics and frequently finds ways to get around them to correctly rank quality content.

It appears Google has just revised its page ranking algorithm to reduce the rank of many of the sites that use this tactic. Full details on Techcrunch.