@Louie Mantia 's iOS icon template was perfect for creating iOS app icons. Unfortunately exporting icons from that PSD was not easy(since I didn't use IconBuilder). I decided to customize the PSD a little bit so it can export all size of icons in one click.
And here it is! A sliced PSD and a Photoshop Action set:
DOWNLOAD THEM HERE
How to use:
Import the actions and create your icon in "Icons" group. Play the actions to export all size PNG files. The files are named after Apple HIG and ready to be delivered to developers. Enjoy! :)
Thanks @Louie Mantia for the icon sheet and also thanks @Michael Flarup , I stole all these slicing and exporting techniques from his brilliant icon template. :P
Update: I updated the PSD so it supports Slicy now! Grab it here.