This brings to mind google's warning re: the use of functional idioms in Java: http://code.google.com/p/guava-libraries/wiki/FunctionalExpl... Objective-C blocks make things smoother than Java, but it still feels to me like the language wants you to have a bunch of small objects sending message to each other. (rather than doing function composition)

That said, I use underscore.js in nearly all of my browser and node.js code, so I'll certainly consider this when the iPhone train comes back around.