Worldwide ad spending to reach $427 bln in 2006 and $451 ln in 2007

Worldwide ad spending will maintain a 6% growth rate for the next 2 years, climbing to $427 bln in 2006 and to $451 bln in 2007, according to ZenithOptimedia. That's slightly better than the 4.8% growth to $403.6 bln for 2005. US spending growth will increase moderately over the next two years, per the forecast, climbing 5% 2006 to $174.8 bln and by an additional 4-plus% in 2007 to $182.4 bln.