A javascript file that records the screen positions of your visitors cursor movements that could be used for a new way of analyse your visitors behaviours. See the working example and be amazed...
It could be useful to see how 1 or 2 specific users navigate throug your website. Also it could be useful on a great scale of web users to trigger where the most cursors are floating over your pages. For example: if 1000 visitors always take a look at external flash banner with hovering with there mouse over the banner, then you know that this banner is getting way to much attention.
Afterall I'm always reading with my cursor scrolling and clicking over some text or a webpage I'm visiting.