If you plan on using the datepicker, formatting buttons, or a jQuery-dependent fieldtype, you should also include a link to jQuery, jQuery UI Datepicker, and the saef stylesheet:
<link href=”{path=css/_ee_saef_css}” type=“text/css” rel=“stylesheet” media=“screen” />
Am I missing something—I can’t find _ee_saef_css—is it something ‘included’ by EE by default?