This useful video of Mike Hay presenting at Cocoaheads is a great run down of some common (and some not so common) debugging tips for iOS and Mac apps. Worth a watch.
New case study on the ImageOptim site reducing the size of the TweetBot package from 33Mb to 16Mb. It would be fantastic if there was a command line version of this so it could be easily integrated into an Xcode build process. I had a quick dig in the bundle and found all of the individual optimiser binaries but couldn't find one that to wrap up the full process like the app does.
Another option for reducing the size of your app bundle by Nick Lockwood. I hadn't heard of JPNG before but this looks really interesting for large background images which still need alpha transparency.
Web based tool to place an iOS screenshot onto a variety of devices in real world situations. The screenshots look slightly out of place as they naturally haven't been adjusted to match the lighting of the original photo but this is a neat little tool nonetheless.