Am I the only one who uses a proportional font for coding? I find it more readable for the same reason it's more readable in books and other printed media.
However, 1-2 space indented code becomes just too ambiguous when rendered with proportional fonts, because the spaces are way too thin. I wish editors would render em or en-sized spaces instead, at least for the line-leading spaces. That way we would get the same indentation as intended with monospaced fonts, but still save horizontal space, while maintaining readability...