I wonder if there's startup milage in a good way of estimating website traffic/exposure? For one, what metrics external to the websites could you use to measur

I wonder if there's startup milage in a good way of estimating website traffic/exposure? For one, what metrics external to the websites could you use to measure traffic? The Alexa toolbar approach skews things towards the kind of people willing to actually run a toolbar. Maybe looking a links, maybe google rankings, mentioning on blogs? Sounds like a nice machine learning application.