Kellie Stevens of AffiliateFairPlay has published a study on the incidence of forced clicks (a.k.a. cookie stuffing) occurring on affiliate coupon sites.
With her research, Kellie sought to determine whether the recent increase in discussion of the cookie stuffing issue in the affiliate marketing community was correlate to an increase in the activity by affiliates.
The report, “Prevalence of Forced Clicks on Coupon Sites,” covers her methodology, results, and conclusions.
Plus, there is a long, contentious thread about the issue on ABestWeb.