Cee,
Don't most advertising clients have accounts setup to identify the referrer?
Most companies who invest in web advertising want to build their own statistics as to how effective the advertising is, not entirely trusting the stats of the person they are advertising with...
edit {
Oh, Second note...
couldn't you just have a link available, with a javascript to "auto click" it on load, and have a standard link in <noscript>?
}