Try something like this perhaps:

    <a href="/retrieve/" class="button retrieve">Retrieve</a>
    <style type="text/css" media="screen">
    .button {
    	font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    	text-decoration:none;
    	color:#fff;
    	background-color:green;
    	margin:1em;
    	padding:0.5em 1em;
    	font-size:2em;
    	text-transform:uppercase;
    	letter-spacing:0.1em;
    }
    </style>

http://jsfiddle.net/zdYbM/

Does feel more modern, but much less clickable. IMO, slight faux 3D effects are still quite helpful on the web

Easy enough to add shadows etc with CSS if you like them, but I do think anything (even just text) would be better than the current buttons - at present they make the site look pretty dodgy and home-made - strange how styling can affect our trust.