Paperless Printer 3.0 works as a virtual printer driver for Windows, and according to Rarefind it can convert any document or application data into one of the following formats: PDF, HTML, DOC, XLS, JPEG, and BMP.
Update: Use at your own risk. At least one of our users reported negative experiences with this tool.
Printing and converting PDF content to HTML content can be of special interest to mobile users. Content from the Web is often stored in PDF files and make it difficult to be read on handheld devices. With Paperless Printer, if it works as advertised, a user can now have his favorite text converted into HTML and then use any offline converter tool such as iSilo, Plucker, or Sunrise to transfer it to his PDA.
Download link; the tool is free for noncommercial use.