A good tool to find out approximately how much traffic runs through your website is compete.com. You can put in up to 3 websites at a time and it will graph traffic trends for the last 12 months. Kind of a useful tool when you're judging the credibility of a new website you've stumbled upon or just plain fun to compare websites in the same space. A competitor of compete.com is quantcast.com. Other good website traffic/quality gauging tools: technorati.com, websitegrader.com, and popuri.us
