Ikaruga: The well-tempered video game.

Unlike the story-driven games that are so popular nowadays but are only good for a single playthrough, the durability of play in a neoclassical shooter like Ikaruga lies in repetition and the quest for perfection.

Katas, ├ętudes, three-man weaves

Dave Thomas (the Pragmatic Programmer, not the Beloved Burgermeister) has been thinking about the value of a disciplined practice regimen in programming.