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Couldn't you modify an existing affiliate script or banner rotation script to do something like that? It'd need to grab IPs and referrer infos from surfers on the way in, easy enough to do from the server logs. Then you could have an include in your 'welcome' or 'signup success page' that would log those IPs and allow you to compare.
Not particularly smooth, I admit, but it'd probably work.
M
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Does not play well with others...
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