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PPC Sponsored Search Listings
Contextual Adserving on other websites (ie google's adsense program)
Search Engine Optimization Industry Revenue
"US paid search advertising spending rose from $923 million in 2002 to over $2 billion last year, according to the eMarketer Search Engine Marketing report. Estimated to grow by $0.5 billion this year and again in 2005, paid search will remain a substantial part of online advertising revenues."