In my part of our Autodesk University 2006 presentation on "What Can DWF Do For You?", I used an example provided by Kirkor Architects:
One of our customers, Luis Cevada from Kirkor Architects in Toronto, CC’d me an email he sent to his commercial reprographer. His reprographer was accustomed to receiving plot files for printing, but Kirkor sent him DWF files instead. In his email, Luis shared the benefits of using DWF files in house and then sending those same files to a commercial reprographer for printing. Not only can Kirkor use the same files, but the files are smaller. In his example, the Plot file and PDF were about 3MB each. The DWF was only 667K. Smaller files are easier to store and transmit. As such, Kirkor Architects standardized on using DWF.
Truth be told, the DWF file was 666K not 667K. I just said 667, because I was not comfortable using the 666 number ("and his number shall be 6-6-6...") while standing in front of and presenting to 328 people. :-) Thanks Luis and everyone at Kirkor Architects!