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wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.

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IT Best Practices, How-tos, Product Reviews, discussions, articles for IT Professionals in small and medium businesses

The most comprehensive, popular and independent site focused on Adobe Acrobat/PDF. Sponsored by Nitro PDF, ARTS PDF, PDFlib and more.

Home page of the United States Patent and Trademark Office

PDF news, information, software and user tips

YouTube is a place to discover, watch, upload and share videos.

Computer tutorials, technology news, software reviews, and personal computing tips.

The Adobe Acrobat User Community is a global resource for users of Acrobat and PDF, with free eseminars, tips, tutorials, videos and discussion forums.

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Smile develops productivity software for Mac OS X: PDFpen for editing PDFs; DiscLabel for designing CD/DVD labels and packaging; TextExpander, the typing shortcut utility; PageSender fax software; and BrowseBack, the visual web history tool.