DocView is a document viewer for Emacs. It converts PDF, PS and DVI files to a set of PNG files, one PNG for each page, and displays the PNG images inside an Emacs buffer. This buffer uses doc-view-mode which provides convenient key bindings for browsing the document. It’s official part of Emacs 23.
Install Emacs 23.1 and enjoy.
An older version, which might be compatible with Emacs 22, can be gotten from my Git repository:
git-clone git://www.tsdh.de/doc-view.git
But you really don’t want to use it. It lacks many features, and I don’t maintain it actively.