If you've not heard of it, MacRuby is an implementation of Ruby 1.9 directly on top of Mac OS X core technologies such as the Objective-C runtime and garbage collector, the LLVM compiler infrastructure and the Foundation and ICU frameworks. Basically means you write in Ruby using Objective-C frameworks, and vice versa. It's pretty damn cool to be honest!

On a couple of occasions now I've wanted to read from STDIN into an Objective-C command line tool, and both times I've had to hunt quite a bit to find the answer because nothing shows up in google for the search terms I used. "Objective-c read from stdin" and "objc read stdin" both turn up results ranging from using NSInputStream ...