I think if we're talking (assuming) about raw traffic from PPC programs, a possible order (in my opinion) might be a tie between Google Adwords and Overture/Yahoo listings, and then FindWhat. Does anyone know of any resources that list the total number of searches "serviced" by each PPC?
Another important question might be which PPCs provided the highest return on investment.
Best of luck,
[edited by: seth_wilde at 6:53 pm (utc) on Feb. 26, 2004] [edit reason] no self-promotion [/edit]
Looksmart used to have some pretty good partnerships with MSN and others. They have now become just another "smaller" ppc option with the only difference being their system is absolutely horrible and their customer service is non existant.
Others may have had luck with them but in my opinion they have changed their offerings so much and "screwed over" so many customers that it's not worth trying anymore.