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Ok, MSIE 6 does not allow 3rd party cookies by default... so my previous solution will not work...
We do the following on our (free) sites...
Set cookie on 3rd party (different domain) via image src cgi --
set cookie with IP info and javascript referrer info.
Upon sponsor cgi-redirect -- read the cookie (active cookie), test the IP again to see if it matches (consistent IP), test for valid referrer (functional javascript)... I'm pretty sure this redirect script will need to be on the 3rd party domain also... ONLY send traffic to sponsor if ALL tests pass... otherwise send the traffic someplace useful.
If someone was smart -- they could offer this service free -- provide webmasters with sponsor-exit stats (%'s of cookies, %'s of valid referrers, %'s of matching IP's, etc...) -- and make money off banners on the stats pages, etc... I'd probably code my own script unless I trusted the programmer... ;)
Call it sponsor-exits.com -- give me a good link for coming up with the idea ;)
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