A great tool for web site owners is to be able to rank your web traffic and estimate the reach of your web site to the world. A tool I have used forever is Alexa (alexa.com) which will allow you to compare your site to others sites and see various other statistics about any site type in the search box. I have been searching around for some comparable sites to Alexa so I can have multiple perspectives of the estimated reach of some of my sites.
Below is an example of Alexa comparing the traffic rank of cnn.com and microsoft.com.
The site that I located that comes closest to the amount of data that Alexa has appears to be compete.com. Below is an image comparing the traffic rank of cnn.com and microsoft.com again to show the similarities between compete.com and alexa.com.
There are some other sites that will provide various statistics however Compete appears to be the closest. If you want to check out another site that will provide useful information regarding web traffic then check out Quantcast. I believe Quantcast is more of a web analytics tool similar to Google Analytics though.