MultiMarkdown exports readable text files to HTML, PDF, POD, RTF, DOCX, LaTeX and OPML; yet it produces highly structured documents (with titles, outline, footnotes, bibliography, etc.
MultiMarkdown for Windows is free, opensource and has an postable version already.
"MultiMarkdown, or MMD, is a tool to help turn minimally marked-up plain text into well formatted documents, including HTML, PDF (by way of LaTeX), OPML, or OpenDocument (specifically, Flat OpenDocument or ‘.fodt’, which can in turn be converted into RTF, Microsoft Word, or virtually any other word-processing format)."