“Above the fold,” isn’t as relevant to web design as it used to be. Today, screen sizes can be all over the board and even if they were uniform, browser windows can be resized to any dimensions. Additionally, all of the majors browsers (including, most importantly the iPhone version of Safari) support zooming instead of text resize. So, all those variables together make it near impossible to guarantee that any portion of a webpage is immediately visible in the viewport before the user scrolls.

–Timmy Christensen