lets people upload and share their papers or entire books via a social-network interface. iPaper uses a Flash-based document reader; can be embedded into a Web page; Documents uploaded to Scribd can be set to private to public view. If a publisher desires, public documents can be made available for download. Registered users of the Scribd service can comment on documents host on Scribd's website. Public documents can be searched or browsed by category and popularity. In short, Scribd is like YouTube or SlideShare for documents.
Docuter is a free service that allows users to store and share large documents. Docuter claims to support 200 different document and image formats. Docuter is similar to the Scribd document hosting and sharing service. Docuter and Scribd make it possible to embed documents, including PDFs, into your blog or website.