Ho esaminato alcune demo e non ho idea del perché non riesco a far funzionare il giro CSS3. Sto usando l'ultima versione stabile di Chrome.
Il violino: http://jsfiddle.net/9Ryvs/1/
div {
margin: 20px;
width: 100px;
height: 100px;
background: #f00;
-webkit-animation-name: spin;
-webkit-animation-duration: 40000ms;
-webkit-animation-iteration-count: infinite;
-webkit-animation-timing-function: linear;
-moz-animation-name: spin;
-moz-animation-duration: 40000ms;
-moz-animation-iteration-count: infinite;
-moz-animation-timing-function: linear;
-ms-animation-name: spin;
-ms-animation-duration: 40000ms;
-ms-animation-iteration-count: infinite;
-ms-animation-timing-function: linear;
-o-transition: rotate(3600deg);
}
<div></div>