Thought so myself, so I used mailinator. The book looks cute, though, despite my unfettered hatred for the Ninja term (don't get me wrong, I lurve ninjas, but programmers are neither Japanese assassins nor famous musicians).

Rather generious formatting, though. Printed, this would be one of those books that could've been done with half the pages and still be as readable. (And for online reading, who needs margins and reference sections?)