@erikvold
Can You Execute The GWO Conversion Script With A IFrame Across Domains? or Subdomains?
Answer
I tested this on different subdomains about a week ago and that worked. Then I just recently tested this across different domains, and it turns out that it will only work if the user/visitor's browser allows third party cookies, which is obviously not good enough to rely upon. So it is not a good idea, and I recommend that you use a standard method of handling cross domain tracking, which I intend to blog about.
Aside
Having said that this is not a worth while idea, I do want to mention how to ensure that this method works for all browsers =] So if you are just so inclined, then I suggest you read this article on how to set third party cookies with an iFrame.