> I disagree. People needs to have fixed headers that auto hides on scroll down and auto shows when you start scrolling up.

I still find that very annoying. Sometimes I have to scroll up and find that damn thing covering part of my screen again.

Fortunately I have a bookmarklet that zaps all the position:fixed elements to static :) It works brilliantly in 99.9% of the cases :)

https://gist.github.com/tripzilch/5656025