Okay, this was news a while ago, but it's been sitting in my inbox while I decided what to do with it: through the magic of Amazon's kindle app store, Zork and other interactive fiction games are coming / have arrived on the kindle.

If you're wiggling your eyebrows at the term 'interactive fiction', think "choose your own adventure" on steroids. There's an explanation at the link, but it's essentially a story-based adventure game on computer, but it uses text only - paragraphed descriptions of everything you can look at, touch or otherwise interact with.  You type in commands like "go north", "take keys", "hit troll" "pick lock with straw" and the game responds accordingly. 

They've been quietly developing alongside more conventional computer games, developing quite sophisticated tools for construction of stories and worlds, and even their own annual competitions, and while the learning curve for producing them isn't gentle, it's certainly a fascinating idea to start blending the line between "book" and "game" so thoroughly on the kindle.