Industry watchers predict that overall online ad spending will increase by about 3 percent for the next two years, for a total of about $29.1 billion in 2010. The growth is being driven by search engine advertising (especially pay-per-click), which is expected to jump 13 percent by 2010.
Also growing rapidly is "Web 2.0" advertising (on video and social networks), though it represents only a small portion of the market because advertisers are still grappling with the formats. It is expected to increase by 20 percent - to $1.4 billion - by 2010.
(Source: ClickZ)
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