Above is an attention map based on Jakob Neilsen’s two eyetracking studies (http://www.useit.com/alertbox/scrolling-attention.html and http://www.useit.com/alertbox/horizontal-attention.html). Darker areas represent more time. The coloring and shading values might be a bit off, but the general idea should be clear.

These studies should be required reading for web workers. The most important takeaways (tl;dr) are that 1.) Despite the best wishes of designers, the page fold is still a barrier, and 2.) Attention is skewed left.