Pdf and Document sharing websites are one of the best ways to get high PR do follow backlinks to your website or blog. What you have to do is, Just write an article with an image and save it in PDF format and here you go, Start submitting your PDF file to these Dofollow high PR PDF and Document Sharing Sites.
As you can see, All the sites listed below are high PR and Dofollow. Now just grab the high quality links for your website or blog and improve your search engine rankings. Have a look at this list:
Hope, This list will help you improve search engine ranking. Do let me know via the comments if I have missed any PDF Sharing site which you think should have been included in this list and also tell me which are your favorite pdf and document sharing sites from this list and why?