This will add a subtle drop shadow to all images on a page. Works with all major browsers excluding Internet Explorer 8 and below. The beta version of Internet Explorer does support box-shadow. There's a nice writeup on box shadow here: http://www.css3.info/preview/box-shadow/

img { box-shadow: 2px 2px 5px #11111; -moz-box-shadow: 2px 2px 5px #11111; -webkit-box-shadow: 2px 2px 5px #11111; }