Smashing Magazine: Printing the Web: Solutions and Techniques

http://www.smashingmagazine.com/2007/02/21/printing-the-web-solutions-and-techniques/
"Users don’t read, they scan. In fact, after many years, reading online still didn’t manage to assert itself against reading offline. Therefore long articles are usually printed out and read on paper. However, not every page will be printed out correctly by default - sometimes layout doesn’t fit, sometimes font size isn’t chosen properly or leading simply isn’t big enough. It is also important to include some further references to the printed version of the page, so users can get back to you, once they’ve read the printed version of your article."