iPhone Retina Graphics
<p>I have a question RE Retina display graphics (and potentially iPad 2 graphics if the rumours of double resolution displays are to be believed).</p>

<p>Is there any advantage to having two graphics:
Graphic.png 480x320
and 
Graphic@2.png 960x640</p>

<p>and letting the iPhone use the @2 version for retina displays rather than just having Graphic.png at the higher res and letting iPhones with normal displays squash it?</p>
