Reminded me of the "Rules of Comfortable Measure", from The Elements of Typographic Style, quoted here:

http://webtypography.net/2.1.2

I always find myself fighting this on practically every website.

But it makes sense to me, that this should be something we think about in, well, most of our editors as well.

I debate about the measure of code, but I do find 100 to be a reasonable fit for most languages. The problem, is that I want code at 100, and then comments at 66. Oh well.