Alexa is by far one of the greatest web analytics tools out there. The site is run by amazon.com, so you can be pretty sure that their information and statistics are pretty accurate. Alexa is a beautifully designed website. Statistics, such as the traffic ranking of websites, is presented in a way that can be easily understood. Graphs are all over, another feature of Alexa that makes it a pleasure to use. The only problem with Alexa is that it sometimes hard to find information/statistics when it comes to smaller websites.