Jesse -

> I'm looking for a comprehensive ad tracking
> solution that can track each individual ad
> or marketing initiative, all the way through
> from click to sale. Including opt ins,
> popups/unders, etc.

I suspect you will need/want one of the shopping cart solutions that can do this. In their Marketing Braindump, Alex Mandossian talks about 1shoppingcart.com as being the one he uses. I see that many people are now going to WebContactPro. I have never used either one but Alex was singing the praises of 1shoppingcart and it sounded like it had the features you require.

The only other solution I can think of is for you to use a tracking script and *track* everything.

Rick Smith, "The Net Guerrilla"