A friend sent me this site that features studies tracking the eye movements of readers of a given webpage.

Lots of useful information, including the fact that the upper-right and bottom quadrants of a webpage typically are not seen well by a reader.

Worth checking out: The Best of Eyetrack III:What We Saw When We Looked Through Their Eyes:

The eyes most often fixated first in the upper left of the page, then hovered in that area before going left to right. Only after perusing the top portion of the page for some time did their eyes explore further down the page.