Posted 16 February 2009 - 11:26 AM
Most of the solutions mentioned above, such as ComScore, Hitwise and Google Analytics are external tracking systems. Because they are easier to manage, and have less false positives, they tend to be the popular choice. Many larger sites will invest in a combination method, where internal log data is combined with external information to create a comprehensive overview of the site's traffic. The solution you choose, however, should be based on your exact requirements. If you simply need to get a quick overview of your traffic that is generally error free, and you don't need to track data on media files, I would recommend Google Analytics.
The only way to learn anything is to question everything.