The search-engine based advertising market is worth between $2 billion
and $2.6 billion.
Please refer to the relevant excerpts below.
?According to Jupiter Research, search-engine based advertising is a
$2 billion market that accounts for about a quarter of the total
online advertising market.
Analysts predict that it has the potential to grow to about $6 billion
over the next few years, led by the three major search providers
Google, Yahoo and MSN.?
CNN Money: April 30, 2004
?Six-year-old Google, founded by two Sanford University graduate
students, has become the major player in the $2 billion search-engine
advertising market and has created one of the most recognized brands
largely through grass-roots, word-of-mouth advertising.?
L.A. Lorek, Express-News Business Writer
From a Bloomberg News Feature:
They're trying to take a larger share of the $2.5 billion search-
engine advertising market after sales of such ads almost tripled last
Bloomberg News Feature: April 2004
?Paid search will continue to grow faster than any other sector of
online advertising, increasing from $2.6 billion in 2004 to $5.5
billion in 2009.?
Vision Report: August 6, 2004
According to META Group the search engine advertising market will
reach $5 billion by 2006.
Search engine Lowdown: October 15, 2003
Search terms used:
" search-related advertising OR ad market" +billion
" search * advertising OR ad market" +billion
I hope this helps!