Do you want to know how much your site is getting traffic? or Do you want to spy (or 'research') on your competitors to know how much traffic their sites are getting? In Today era there are a bunch of sites are present which provide traffic estimation services (like Alexa, Compete, Quantcast, etc). By using these services you can obtain statistics (page views+ unique visitors) of any website for free. 1. Alexa - It provide you an estimate of the percentage of Internet users that may have visited site during a given period. 2. Trends for Websites - Google Trends use the data from the Google Search, Google Analytics and other Third-party market research services. Trends For Website can give a fairly accurate estimate of site traffic. 3. StatBrain - This service claims to provide a count of daily visitors of any website.It use the data form a number of extenal sources like Alexa Rank, backlinks in Google, location of web server, etc. 4. Compete - For estimate US traffic for web...