Excellent post Clarke.
With regards to this: "The networks use 302 redirects to forward the browser on to the merchant. The browser will then send the same request headers to the merchant as they did to the network, including the referer. I've just checked this and the data is definately available. http://tracker.networkname.com will not show in the merchant's logs."
Seems like I have to rethink a strategy here... lol. I always thought that my redirect scripts would prevent the networks etc. from seeing exactly what page my visitor came from... while I could keep track of that info. Arrrggggghhhh....
What I would like to know is how I could block this information from being passed on? Do I have to use a 301 redirect instead???
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. Either a meta refresh or javascript can be used to stop the referral information being passed on, but neither are ideal - meta refreshs cause a pause in the navigation (e.g. when you click out of kelkoo) and javascript won't always be turned on. Even when using those, others can still use things like searchengine caches and backlinks to trace things back. I just link directly or via a 302 for updating my own stats.

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