I just found an interesting blog called the Eyetools Research Blog. Eyetools is a company that has developed eyetracking technology that creates heatmaps showing which areas of a web page subjects focus on. Eyetools will do a ministudy on your homepage for $1000 using 10 subjects, thats not too bad I suppose. I am always amazed by with the things information architects are coming up with.
Here's what a heat map, and an individual eye flow looks like:
They will be posting some studies on blog reading on their research blog soon.