For anyone who has issues reading from an LCD or CRT for long periods of time, you can pick up a Sony Reader or Amazon Kindle. Sony’s device will display .doc, .rtf, .pdf, and .txt files out of the box. PDFs can be a little hard to read on the device because of how they are scaled, but there are 3rd party tools out there to convert PDF to RTF.
Matt talks about a free tool to print to PDF files. Another e-printing option built into Windows Vista is the “Microsoft XPS Document Writer” printer. You can create a portable document without installing any 3rd party tools. This option is for anyone who exclusively uses systems that can read the .xps format.