This is an excellent piece from TheFutureBuzz.com. These six Laws are very important to understand, and a few of them you’ve probably never heard of!
It’s important to understand how a user will look at your design, even if they are not even consciously aware of it themselves. We consider this whenever we’re laying out a page for our clients. Eye track studies focus on how the eyes move around a page; what they look at first, second, third; and where their attention is most drawn toward.
Google posted an interesting article about this in their blog today:
Official Google Blog: Eye-tracking studies: more than meets the eye.