PDFMyURL is a website that can be used for converting website or a single webpage into a static pdf file. The tool does a phenomenal job at maintaining formatting, including correct font sizes and in-line images. Advanced users also have a number of tweaks they can add to the end of whichever URL they drop in that can change how the PDF is created, my favorite being the size of the paper on which you may intend to printing it.
PDFMyURL also offer some advance options to add this service on your website for converting webpage into a PDF file or use the service from your own server.
