Choose Your Own Adventure
Via Mike Migursky's snippets, Samizdat has put together a graphic of all possible routes through The Cave of Time, a Choose Your Own Adventure book.
Each arc is a decision in the story, with the weight/brightness of the arc reflecting the number of unique paths that include that jump. Boxes on the horizontal axis represent the pages of the book in order, with bad endings colored bright red, good endings colored pale yellow, and mediocrity in between. Arcs above the midline move left to right; below it, right to left.
We grappled with a whole bunch of interesting Choose Your Own Adventure problems when designing The (Former) General as part of We Tell Stories, and Adrian posted earlier this year about how we went through the process of designing that story.