http://www.w3.org/hypertext/WWW/Tools/Word_proc_filters.html
This page reviews filters and file format converters used to translate files in Macintosh, Windows, and UNIX formats, such as Rich Text Format (RTF), Word for Windows, WordPerfect, PostScript, LaTeX, QuarkXPress, Interleaf, troff, and others to HTML. It provides links to the software available for making the translation.