Slideshare allows you to upload slideshows (such as Power Point) to share with others. You can also search among uploaded slideshows for a presentation that might fit your needs. One of the best features of Slideshare is that it turns your slideshow into an embeddable document that you can add to your website. Slideshare is also completely free, unless you decide to upgrade to a Pro account. But enough of me; let the Slideshare people tell you for themselves why you will love their product...
SlideShare Quick Tour - Summary of features & capabilities
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