Just another tidbit from the killer Adwords class (of which I get no toaster, I just was really jazzed to have a class that was filled with value and given by a smart and experienced individual).
One piece of research he gave us was called "Where Users Click" - a study of the surfing habits of individuals. It turns out that if your link is right of the visible area on the screen (meaning you need to horizontally scroll to see it), all the clicks there total only 0.4% of clicks!
And if you want to see the value of having your most important links visible without vertical scrolling (which is called "Above The Fold" after the newspaper term) - 76.5% of all clicks happen here.
Your ever-lovin' Google Guy