The Interactive Advertising Bureau has released the latest numbers for online advertising:

The Interactive Advertising Bureau (IAB) and PricewaterhouseCoopers (PwC) today announced that Internet advertising revenues for 2007 are estimated to grow to $21.1 billion, a 25 percent increase over the previous revenue record of nearly $16.9 billion for full year 2006. Q4 2007 revenues totaled approximately $5.9 billion, making it the highest quarter ever reported and representing a 13 percent rise over the third quarter of 2007 and a 24 percent increase over the fourth quarter of 2006. All four quarters reported in 2007 include record level revenues.