This article, in InformationWeek, talks about the shifting of advertising dollars being spent on search engine marketing, a 44% increase in 2005, making it a 5.75 Billion dollar segment.

It would seem that the ever-increasing mediums to get to customers are something that must be continually explored. How long until there is a software available to limit the display of this type of advertising? Could the government step in and allow people to register IP's to a do not-advertise list, to limit this type of "spam" advertising? These are all market forces that must be identified and addressed for the advertising industry.