In North America, advertising spending is expected to increase 12.3 percent from 2006 to 2009, according to ZenithOptimedia, SFN's World Digital Media Trends 2007 reported.

Although TV, newspapers and magazines are still the top contributors to advertising spending in North America and will do so for years to come, they are now slow-growth markets. TV is expected to grow only 4.5 percent from 2006 to 2009, while newspapers will be up only 5 percent, the study predicts. Meanwhile, magazines will increase 16 percent within the three years.

However, ZenithOptimedia predicted huge increases in Internet, cinema and outdoor advertising between now and the end of the decade, which are expected to grow at rates of 65 percent, 52 percent, and 37 percent, respectively, according to the report, World Digital Media Trends 2007, released by SFN and the World Association of Newspapers.