Originally Posted by jayeff

I'm not knocking the intentions of this thread, but isn't it too narrowly focused?

A surfer clicks a link on my site and the scumware triggered window (usually) pops on top of the site I want him to visit. At this point my chance of selling him anything has already taken a major dive.

The issue of overwriting cookies actually only becomes relevant if the same sponsor is popped as the one which I am promoting. And even then only when cookies are the sole tracking method. If the surfer joins, carrying someone else's referrer ID (because he clicks on the page which showed above mine), correcting the cookie - I believe - will not help.