Sharing and reviewing office documents and presentations via web site with others can be quite a pain. Placing this type of file as an attachment is not always the most practical.
Online service Crocodoc (crocodoc.com) takes your PDFs, Word documents, and PowerPoint presentations, and lets you view and mark them up online. Documents can be shared with others, who can collaboratively highlight or strikeout text, add notes and comments, and make revisions. No Flash or plugins required.
And now, with Joomla! 1.5 plugin Crocodoc PDF HTML5 Viewer, you can easy use Crocodoc API and display the viewer at your joomla articles.
All you have to do is enable plugin, and put tag like:
{pdf}Your_PDF_File_URL{/pdf}
at your joomla article. Remember to put URL with “http://” in the document path. Now you will see nice Crocodoc document viewer.
Others extensions like GoogleDocs Plugin (link) – uses GoogleDocs Service. All this solutions are cloud based.