http://www.cutepdf.com/products/cutepdf/writer.asp
This strikes me as being a quick way in which I can 'print' a whole host of different filetypes as reasonably easy-to-read .pdf files for use on a Kindle. After installing the program, I realized I already had this type of program on my laptop in the form of MM composition Writer and Microsoft XPS Document Writer. Previously, I hadn't the faintest idea what these programs were for.
I suppose I should now go a step further and see how well the files convert to mobi files with Calibre.