Sildeshare

SlideShare is a Web 2.0 based slide hosting service. Users can upload files privately or publicly in the following file formats: PowerPoint, PDF, Keynote or OpenOffice presentations. Slide decks can then be viewed on the site itself, on hand held devices or embedded on other sites. Launched on October 4, 2006, the website is considered to be similar to YouTube, but for slideshows. 

The website was originally meant to be used for businesses to share slides among employees more easily, but it has since expanded to also become a host of a large number of slides which are uploaded merely to entertain.

Slideshare isn't in spanish, but if it's in English: www.slideshare.net

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