http://browsersize.googlelabs.com/
I don’t have to say much more. Look at that and make sure your elements are arranged by importance. It’s useless to have everything above the smallest fold, but weigh the pieces of your site against the percentage of users who’ll see it.
Also, they’ll scroll for something like content. It’s those first-impression things you have to put near the top.
What they won’t scroll for, really, is stuff to the right of their viewport. Be careful when things are beside the fold.
Tags: The Fold