I tested a simple script to parse text of a proofread page and to output the list of different words into the page. My aim was mainly to  find my mistakes when working about ancient, or unknown, languages: see http://pt.wikisource.org/wiki/P%C3%A1gina:Bem_cavalgar.djvu/40 (a 15° century  portuguese book) and its talk page, where there's an example of such bot-created list of words. This rough script could be expanded, to produce the whole list of different works into a book, anyone linked with the proofread page where the word has been used. Could this trick be useful as a link between wikisource work and wiktionaries?