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The following are some websites that mainly focus on PowerPoint presentation, They are all in English. http://www.presentationhelper.co.uk http://www.powerltd.com http://www.garrreynolds.com http://www.presentations.com http://www.presentationteam.com http://www.perceptualedge.com http://www.presentationpro.com http://www.pptools.com http://www.slideshare.net http://www.bamagazine.com http://www.speakingaboutpresenting.com http://www.extremepresentation.com http://officeone.mvps.org