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Google adwords and Yahoo adsense are two great PPC search engines. What I have learned about the 2 of these is that it cost only $5 to start an adwords account with google. When to start a Yahoo adsense account you will pay $40 plus to start. You could use the other $35 for keywords and clicks through Google. THE CATCH is that if you type a search in Yahoo or Google tool bars you will notice that the results are shown exactly the same in either tool bar.Yahoo and Google are already linked together....