The Interactive Advertising Bureau (IAB) and PricewaterhouseCoopers (PwC) announced that Internet advertising revenues for 2006 are estimated at $16.8 bln, a 34% increase over the previous revenue record of $12.5 bln in 2005. The Q4 2006 revenues totaled just under $4.8 bln, making it the highest quarter reported. Q4 2006 revenues represent a 32% increase over Q4 2005, and a 15% increase over Q3 2006, estimated at slightly under $4.2 bln.