- Interface hierarchy
- Pixel-perfection
- Subtlety & realism
- Make it look expensive
- Create a visual language

Image-less noise texture on UIViews! Crazy!

"This is a quickie pair of categories on UIAlertView and UIActionSheet which enables you to use blocks to handle the button selection instead of implementing a delegate."

Directory of URL schemes that iPhone apps support.

"The end result is that, with zombies enabled, messages to deallocated objects will no longer behave strangely or crash in difficult-to-understand ways, but will instead log a message and die in a predictable and debugger-breakpointable way. This is the tool to use when trying to track down over-releases and premature releases."

"To cover the majority of testing needs, KIF comes with a number of factory test steps built in, such as 'tap this view,' 'turn on this switch,' or 'type this text.'"

The Core Animation-based UI framework used in Twitter for Mac.

How to draw AppKit classes onto a CALayer.

"NSCollectionView is a grid-like structure which contains views. It's similar to NSMatrix, but for NSView objects rather than NSCell objects. Compatible with Leopard (10.5) onwards. It's possibly used by iPhoto for displaying photo thumbnails."

Perfect for Instagallery.

FMDB, an easy Cocoa wrapper around SQLite.

How to add to the list of Login Items

"When we said that Cocoa does nearly all of the work for you, we weren't kidding. Simply put the information in the right spots and it all works."