eMarketer recently predicted that online advertising will grow by 28.6% in 2007. Other ad forecasters, such as PricewaterhouseCoopers and Universal McCann's Robert Coen, have internet ad revenue growing in the mid 20% range. Search is the largest part of internet spending at 40%.
Radio is growing by less than 1% and eMarketer expects that this year internet spending at $21.7 billion will overtake radio at $20.4 billion. Radio is seeking to market itself as a complement to internet advertising rather than a competitor. For instance Clear Channel found a way to sell search terms on it's local radio web sites to community advertisers.
According to ZenithOptimedia, internet ad spending in China, growing at 70% a year. from AdAge