Are there any generally-accepted coding standards (naming, casting etc) that apply specifically to iPhone/Cocoa/Objective-C? I know Microsoft has published similar standards
Google also has an Objective-C style guide
The Code Commandments: Best Practices for Objective-C Coding is a style guide I can happily endorse.
Here are two more Objective-C style guides:
Introduction to Coding Guidelines for Cocoa
Enjoy!
Also take a look at Cocoa Style for Objective-C from Cocoa Dev Central