Advertising spending forecasts for next year represent the first glimmer of hope that the ad market will finally stabilize after an unprecedented downturn. Three leading industry prognosticators weighed in with predictions for next year: ZenithOptimedia said advertising spending will grow globally by 0.9% in 2010 to nearly $448 billion; GroupM predicted similar growth (0.8%) to $448 billion; and Magna Global had a more optimistic prediction of a 6% global advertising increase to $380 billion.