I thought the state-of-the-art was quantcast. I was just talking to an ad network and they were pushing Compete.com. People still ask about Alexa & Google pagerank. Google analytics feels to me like a standard. Here's a quick list:
Quantcast - gets data from ISP. You can improve data by putting it on your site.
Alexa - gets data from browsers. Easily gamed.
Compete.com - No idea where they get their data.
Google page rank - The green bar is a very simplistic count of how many links in you had some number of months ago.
Google Analytics - Increasingly, this is being generally adopted so they become a uniform way of counting and comparing websites.
Other market leaders?
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