"[T]he web has changed a lot since 2002. Back then, gaudy display “banners” on web portals such as Yahoo! and MSN were the preferred technology. These still exist, but they now account for less than 20% of online ad spending. More than half goes to search advertising on Google and rival search-engines, which place small text ads next to results based on the keyword of the query, and charge only when a user clicks on them. In brand advertising, “rich media” ads are taking over from banners." Read More...