Google Analytics is a free service that keeps track of all visits to your website. It keeps track of an amazing amount of data—how many people access your site, what pages they visit, how long they spend looking at your site, what site referred them to you, what they typed into Google to find your site, all the way down to where (geographically) they are coming from. All you need is a Gmail account and access to the HTML code of your website. In fact, as I was typing this post, my wife laughingly asked “do people even read your guys’ blog?” After half an hour of showing her pie charts and bar graphs and maps, she regretted asking me the question. I guess she doesn't share in my addiction.