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Probably not of much use now, but here are two examples of taking Hypercard stacks that were basically spreadsheets and turning them into real Mac OS X programs.
One of the earliest things I put together was this set of tutorials to make it easier for people to start programming a game. It builds a 2d space shooting game where you pick one of ten ships and try to blow up the ship of your opponent. With the advances in Core this and Core that Apple has provided, this really needs updating. But it's still valid. This one deals with reading the keystrokes and drawing a simple window.
The second installment shows how to add threads and send your keystroke over the network in a very simple manner.
The third in the series adds animation, pixel level hit detection.
Forth, we put it all together and create the full game. With sound, animation, networking, threads, the whole bit.