Compared with the first half of 2007, online ad spending grew 15.2 % to $11.5 billion in the U.S., the Interactive Advertising Bureau (IAB) announced Tuesday.  The rate of Growth slowed forn from 27% in the first half of 2007 compared with the same period in 2006.

As a percentage of total revenue

Search advertising increased from 41% to 44%
Display ads (Banners, video & rich media) increased from 32% to 33%
Classified ads decreased from 17% to 14%