PdfMeNot allows users to easily view existing PDFs on the web in a Flash-based viewer instead of having to open up a separate PDF viewer, which can be slow or sometimes impossible if the software is not installed.
The site also allows easy linking of the Flash version. Just say you wanted to link to: http://test.com/document.pdf
You can use this link instead: http://pdfmenot.com/view/http://test.com/document.pdf
Other tools available through the site include a Firefox extension, a script for bloggers and webmasters to convert all PDF links and a script to embed Flash versions of PDFs on web pages.