The Interactive Advertising Bureau (IAB) and PricewaterhouseCoopers LLP (PwC) today announced that Internet advertising revenues reached almost $5.9 billion for the third quarter of 2008. Such growth represents an 11 percent increase over the same period in 2007, while quarter-to-quarter growth is slowing.

As you can clearly see in this chart – growth flattens in each quarter of 2008, unlike the sharp growth of previous years. This is simply confirming what we already know, spending on internet advertising has seen a serious slow in growth rates.