I'm running around, updating the imagery for iPhone 4's retina display. Basically, you make a double sized version and slap an @2x on the end of it, like
Default@2x,png, Icon@2x.png ...
The Retina display is so nice, it really makes the iPad look funny. I think at some point there will be a Retina display for iPad, but it would have to drive
1536 x 2048 screen at video rates. But it would be really nice.

Anyway, I'm still waiting for SrutiBox 1.3 to get in a reviewer's hands.