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Search Engine Forums Spotlight Links to this week's topics from search engine forums across the web: Click-Fraud Said to be 50 of Clicks - PPC  #91;Pay Per Click #93; And Affiliate Marketing, Will It Last? - Press Releases for Link Development - New Adwords Traffic Estimator - AdWords: Is Broadmatch Really Bad? - Marketing Tactics with Shopping Search Engines - How To Optimize PDFs 