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A survey of 1,200 advertisers last November found that 71% said the ads on Google were effective for them. That compares to 62% who said the same about Yahoo! ads and 49% who said MSN Search ads were effective. This according to a study released last week by research firm Outsell. At the same time, the Outsell study found that those marketers who favored Google as "extremely effective" had smaller marketing budgets than those who said the same for Yahoo! and MSN ads: $3.7 million on average among the Google fans, versus $4.6 million average budget for the Yahoo! and MSN aficionados.