The big things I want this to do that Urbanspoon doesn't would be to rate dining halls in addition to restaurants and to find very specific walking distances from certain residence halls on campus. I am kind of basing my idea on Urbanspoon, but with more of an individual college focus.
But basically, ePub is full of bugs (that take ages to be solved until the huge committee agrees on every point), it is complex to build and debug, and does not support HTML5. Heck, there is not even a way to define a cover.
Just to be clear, HTML5 is composed of many parts. You might be thinking about canvas or video/audio, but one of the most important introductions are the new tags, that turn out to be perfect for crafting electronic publications (semantic richness). That you can use it in ePub doesn't mean you're meant to.
I'd be interested if he had given me a reading from the book. I don't understand exactly what he's selling me - a cool version of a Dummies book, perhaps?
What I love about it—his main point—is his conjecture that it's not a far step from the "challenge everything" mentality of the original punk movement to "challenge everything" mentality that the brightest kids engage math with. Just apply some rigorous thinking.
It's a different way to approach math, directed to an audience that typically doesn't do a whole lot of it.