Autoview and associated files are available from http://www.glue.umd.edu/~deego/emacspub/autoview. This userguide is available from http://www.glue.umd.edu/~deego/emacspub/autoview/usrguide/usrguide.html.
While you are editing your file.tex, autoview will (run in a separate emacs and) continually, intelligently, and automatically keep processing your latex file, generate a .ps file and gv (view) the file for you.. You can modify it to suit your needs..