Antiword is a utility to read Microsoft Word files and convert them to plain text, PostScript®, or DocBook files… The DocBook stuff is still experimental, but the plain text seems to work quite well for me, and I’ve successfully turned Word files into PostScript® files, and then turned those into PDF filess using ps2pdf. You could go one step further than the PS to PDF Converter site and build an online converter to turn Word Files into PDF files, or, well… whatever else you can dream up.
(See also: antiexcel)