What does printer-friendly mean to you? To me, that means black-and-white interiors and a mostly white background, probably a two-column format, and most of the time, a sarif font.
Yeah, but for the 99% of folk who don't have an iPod touch, "single column landscape" is the worst format in terms of readability.Landscape, single column. It makes it easier to convert it to epub format for reading on my Ipod Touch. Columns just screw up the formating too much.