This is one of several ‘virtual printer’ The Portable Document Format (PDF) is a file format developed by Adobe to present documents in their original formatting, independent of software, hardware, and operating systems. PDF files can contain text, graphics, links, and buttons, form fields, audio, video, and file creators.
See http://www.cutepdf.com for more details.
Updated by tatewise (31/10/10)
I have used both PDF995 and CutePDF Writer and have found both to be excellent. (Nick Walker is the author of Ancestral Sources, used with Family Historian (FH) to standardize the entry of Census, Birth, Baptism, Marriage, Death, and Burial/Cremation records for England, Scotland, Wales, US, Ireland, and Canada. Custom templates can be created within: 28th Oct 2006)
Link: CutePDF Writer