Worldwide internet ad spending will jump to $44.6 billion in 2008, from about $36 billion, increasing its share of the market to 9.4% from 8.1%, according to ZenithOptimedia.

“We predict internet advertising to pass three milestones over the next three years,” according to¬† ZenithOptimedia’s forecast, scheduled for release Dec. 3. “We expect it to overtake radio advertising in 2008; to attain a double-digit share of global advertising in 2009; and to overtake magazine advertising in 2010, with 11.5% of total ad spend.”

Advertising Now International

In addition to noting the growing importance of new media, ZenithOptimedia also notes a trends toward international ad spends.

“North America used to be half of advertising expenditures,” said Tim Jones, CEO of ZenithOptimedia Americas. “We’re seeing its share drop a full point every year at this point. That’s being made up for everywhere east of Eastern Europe. Look at the multinationals and where their investments are focused: the Russias, Chinas and Indias of the world. That’s true of our business and media vendor companies as well.”

Between now and 2010, according to the forecast, the 10 fastest-growing ad markets will be Kazakhstan in the pole position followed by Belarus, Serbia, Egypt, Russia, Moldova, Indonesia, the United Arab Emirates, Ukraine and what the agency refers to as “Pan Arab.”