Patrick McCarron's
Infinite Shamrock

Andrey Subbotin put together a great Ruby script for updating your app’s art assets for Retina screen on the iPhone 4. It is a great looking utility, I suggest you check it out.

We were updating our app’s graphics for the gorgeous screen of iPhone 4 the other day and it was a pain to update all the 163 PNG files we had and not to miss a thing.

So, I’ve come up with a simple Ruby script that checks that for each @1x image you have a properly sized @2x image.