Outdoor advertising, mainly billboards, are suffering in the current business slowdown.
Online, the only platform that is expected to grow this year, will grow 9% this year and reach 14.9% share of global ad expenditure by 2011. Newspaper and magazine ad expenditures will continue to decline through to 2011. Television, cinema and outdoor will return to growth in 2010, followed by radio in 2011. [More]
Like painted barn roofs and sides, we could see the slow decline of this medium.
But before they go, some true masterpieces (these are my 3 favs):