web tracking codes

[Robin Wood <robin () digininja org>]

I'm building a tool to scrape websites and pull out tracking codes so
I can see which sites are related based on who is tracking them.

Google codes are good for this as they identify the tracker not the
site, Woopra tracking identifies the domain not the tracker so there
is no way back to the person/group tracking the site. What other web
tracking systems are out there which can be used to identify the
tracker rather than the site?

In case that doesn't make sense, this is Woopra code:

function woopraReady(tracker){
    tracker.setDomain('yourdomain.com');
    tracker.setIdleTimeout(300000);
    tracker.track();
}

which identifies "yourdomain.com" but this is google

try {
var pageTracker = _gat._getTracker("UA-7503551-1");
pageTracker._trackPageview();
} catch(err) {}

which identifies the tracker.

Robin
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