Report: Four Ad Categories to Dominate Through 2009 »

Some categories will reap a disproportionate amount of the spoils as online ad spending increases to $16.1 billion by 2009, according to a new report by JupiterResearch. Double-digit growth is expected in four categories, including automotive, which will grow 33.8 percent; health (19.7 percent); travel (18.3 percent); and household goods (15.1 percent).