There are 3 previous versions of this script.
// ==UserScript==
// @name Open with Google JS PDF Viewer
// @namespace http://userscript.org/
// @description Looks for PDF links in the page and sets them to open in Google's Javascript PDF reader.
// @include *
// @exclude http://docs.google.com/*
// ==/UserScript==
(function () {
dl=document.links;
for(i=0;i<dl.length;++i){
if(dl[i].href.substr(-4)==".pdf" || dl[i].href.substr(-4)==".ppt" || dl[i].href.substr(-4)==".doc"){
dl[i].href="http://docs.google.com/gview?url="+dl[i].href;
}
}
})();