DrawingManager<http://code.google.com/apis/maps/documentation/javascript/overlays.html#drawing_tools>allows you to provide your users with the ability to add new markers to the map by clicking on it. The mouse cursor doesn't change to be a marker as you describe it (it's a crosshair instead) but it is otherwise functionally the same as what you describe. To implement step 3, listen for a 'markercomplete' event on your DrawingManager object and show an info window in the event listener.
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