Spider and Web is the perfect distillation of an IF story that is designed entirely around a particular conceit. I'd say there's no way this story could be told in another medium, but (Spoiler - click to show) The Usual Suspects has a very similar structure, though it involves the viewer as dupe rather than Spider and Web's very clever involvement of the reader as the creator of the deception. I enjoyed Spider and Web very much; it's a reasonably short, well contained experience that shouldn't be missed by anyone interested in how interactivity can work in novel ways.