According to IAB's ad spending report, conducted by PricewaterhouseCoopers, online ad spend figures for the first half of 2006 were at $7.9 billion, a 37 percent increase over the same period in 2005, ClickZ reported.

However, the Nielsen Company and TNS Media Intelligence reported a slowdown in online spending growth during the first half of 2007 compared to the same period in 2006.