On myself, I like shoulder length or longer. I am really enjoying my shorter hair at the moment, so much easier to fix.
I like the cute short pixie cuts, but they never look too great on me, so I avoid them.
On guys, I like short or long hair, just not buzzed. I like the goatee/mustache combo, or even a little bit of a beard (the I haven't shaved in a week, but I am getting ready too) I don't like mutton chops though.
@finfish There was the one chick at the office I used to work at, it was down to her ankles. It was so nasty. Can you imagine washing it. Ugh.