Google is constantly changing its search algorithm to give users the best search results possible. The main goal of these changes is to detect spam and find companies that are violating Google's rules and guidelines, such as those who are purchasing links.  Another big change is social search, with Google + (and the +1 button) personalizing your search results so they are influenced by your 'circles'.

To learn more about these changes and how your company can keep on top of them, check out iMarket President Nadia Romeo's featured article in HVACR Business: http://www.hvacrbusiness.com/issue/article/2010/navigating_googles_everchanging_obstacle_course.aspx