Global advertising expenditure will grow to nearly $550 billion in 2011, from about $375 billion in 2003, according to ZenithOptimedia. TV and newspapers are the two media with the biggest shares throughout that time period, SFN's World Digital Media Trends 2009 reported.

The compound annual growth rate between 2003 and 2008 is generally higher than that expected between 2008 and 2011.

The Internet takes a wide lead with 32.4 percent and 19 percent, respectively. Cinema comes next, with 10.1 percent and 7 percent during the two periods, while outdoor and TV follow, according to ZenithOptimedia.

In 2003, TV and newspapers together made up nearly 70 percent of total advertising expenditures, while the Internet accounted for less than 5 percent. In 2011, TV and newspapers together are expected to lose about a 10 percent share, while the Internet is up from 3 percent to 16 percent, according to the report, World Digital Media Trends 2009, released by SFN and the World Association of Newspapers and News Publishers.