There is an English version of the web page for the National Library of France (Bibliotheque Nationale) and it links to a page of English language instructions for ordering photocopies.

Scientific and technical French material can be located at the Institut de l'Information Scientifique et Technique.  Article@INIST allows you to search over 5 million bibliographical references (articles, monographs, reports, congresses, theses).  The database gets updated daily. [This is lifted from http://www.llrx.com/features/european.htm] (found no English verison of the website and don't know what it offers)