The Alexa ranking system is one of the new ranking systems of concern to anyone who is interested in improving traffic to to their website. Alexa is owned by Online Shopping for Electronics, Apparel, Computers, Books, DVDs & more and ranks websites based on the amount of traffic to the website over the past three months, However, the ranking through Alexa are somewhat skewed because the information for a particular website is tracked through visitors who have the Alexa toolbar installed.