The currently active popup hints should close when you click on another other one.  It's very annoying having popups cover other popups.  

http://screencast.com/t/9LaMeZtQvR8E  <-- Short video demo of issue with fix implemented.  

May not be the "best" way to do this, but this works for a demo:

$('div > button').click(function () {
    $('div > button').not(this).popover('hide');
});

Should take a jquery novice < 2 minutes to implement this usability fix.