PDF4U Printer 1.1.0.4 is one of the simplest ways you can find to generate PDF files. What it does is create a virtual printer in your PC which doesn´t print but directly generates a PDF file with whatever you send to it.
Thus any document you send to it can be saved as a PDF, making it really easy to use. You only have to select the virtual printer when it comes to printing, and you´ll have a PDF ready to be saved.
The user can also establish configuration options for the resulting PDF (letter type, resolution, scale, etc).