I don't think I would force this on a published page either, since it's basically a personal preference. But it certainly could be done by one user for his/her

I don't think I would force this on a published page either, since it's basically a personal preference. But it certainly could be done by one user for his/herself. Safari and OmniWeb let you set default stylesheets, and Firefox will recognize one too if you create a [profile]/chrome/userContent.css file.