Alexa gives a lot of details about competitor sites, but it doesn't tell you where the traffic is coming from (at least as far as I can tell). There is a site I came across that is banned in all the search engines, has no backlinks, yet is ranked in the top 50,000 sites according to Alexa. I'm assuming all of it's traffic is redirected traffic as the name is not a common one that people would type into a browser. Is there any online tool that anyone knows of that would help to discover where the traffic for this site comes from.