As you browse, the Extension icon shows you graphically the rank of the site you are visiting, and if you hover your mouse over the icon you can see the numeric Alexa Traffic Rank.
If you click on the Alexa icon, a window appears with more information about the site. You can see what the site's rank is, approximately how many domains link to it, how well reviewed it is, as well as related sites. You can also easily browse to Alexa's search analytics page for the site, or see what it looked like in the past at the Wayback Machine.
Another added benefit is inclusion in the Alexa Traffic Panel. This is the only Chrome Extension that includes you in our panel, and of course only if you decide you want to participate.
Let us know what you think!