The Decade in Online Advertising 1994-2004 is a new 21 page PDF report from DoubleClick that offers a ton of data about online ad spend over the past 10 years. Check out the nice quarterly spend chart on page 4. Page 12 has a nice pie chart showing search at having 40 percent of online spend as of the second quarter of last year. A short history of search ads begins on page 11.
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