The IAB and PricewaterhouseCoopers released U.S. Internet advertising stats today for the first half of 2009 showing a a 5.3% decline from the same period in 2008. Search continues to take nearly half of all Internet advertising, with 47% of the total ($5.1 billion). Display ads, classified listings, lead generation and email took 34%, 10%, 7% and 1%, respectively. In 2008, search only took 44% of total online advertising revenue, so maybe Google’s future for the rest of the year isn’t so bleak.

Retail advertisers represented the largest category of spending, at 20%. Telecom (16%), Leisure Travel (6%), Financial Services (12%), Automotive (11%), Computing (10%), Consumer Packaged Goods/Food Products (6%), Entertainment (4%) and Media (4%) made up most of the rest.

The full report can be seen below: