Here is a bookmarklet I just wrote to look at all the links on a page and open any ending in ".pdf" in google's viewer. (if you have firefox set to open tabs for windows, it will open them in new tabs) Feel free to share and improve.
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javascript:(function(){dl=document.links;for(i=0;i<dl.length;++i){if(dl[i].href.substr(-4)==".pdf"){window.open("http://docs.google.com/gview?embedded=true&url="+dl[i].href);}}})()
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