On the other hand, I often find that my reading position is reset, when I open Safari on my iPad, so the chance of me finishing a long-form article in Safari is not that great.
Slate/Salon tend to put something like 100 words on a page, and NYT also have way too few words on a page. New York Magazine and the New Yorker tend to strike a decent balance, as I seem to recall.
I'm having a hard time finding an example -- IIRC, some CBS news property used to do it -- perhaps they fixed it.