Online advertising revenue reached a record high of $21.2 billion in 2007, according to a new report published by the Interactive Advertising Bureau. The 26 percent jump helped Internet ad revenue move ahead of cable television, broadcast television, and radio. 2007 was the fourth consecutive year of record sales.

 
With 41 percent of the market, search advertising drove revenues. The report also shows that consumer advertisers were responsible for more than 50 percent of spending for the last two years.  While some analysts are more confident than ever in the staying power of online advertising, others suggest that Internet advertising may be particularly vulnerable to a weakening economy.