Very cool stuff, Brian! It'd be interesting to try to cluster users based on what bits of the page they look at (women 65+ look at navigation breadcrumbs significantly more than average, say).
GazeHawk intern here -- I wrote the post. Our post next week is going to be focused more on using different clustering metrics as a way of making the data easier to understand.
We definitely have plans for running some big studies where we can do demographic comparisons, since that sort of information helps us bring a lot of value to our customers, but it might not be for a few weeks.
