It's fairly easy to get the coordinates of your cursor using jQuery. While this information might not be particularly useful to a lot of developers, there are definitely occasions where the x and y coordinates of your cursor can be particularly useful.
The code snippet below shows you how to find the x and y coordinates of a cursor when it's within a particular HTML element (a box, a div...whatever you like), and then display those coordinates through an alert message. The code can be totally customized to have the coordinates instead print to the console, or to have the cursor coordinates be found within the body or the window rather than within a particular element. Use the snippet below as a jumping off point for your cursor-finding code:
var offset = $(this).offset();
var relativeX = (e.pageX - offset.left);
var relativeY = (e.pageY - offset.top);
alert("X coordinate: " + relativeX + " Y coordinate: " + relativeY);