The Two App Stores

Marco Arment:

But they’re not two different stores (“Are you getting it?”). There’s just one App Store at a casual glance, but if you misunderstand which of these segments you’re targeting, you’ll have a very hard time getting anywhere.

Safe Key-Value-Coding

M. Uli Kusterer suggests using:

#if DEBUG
#define PROPERTY(propName)    NSStringFromSelector(@selector(propName))
#else
#define PROPERTY(propName)    @#propName
#endif

to define symbolic constants for keys so that the compiler will give you Undeclared Selector warnings.