Hacking for Kids

I want software and a book that’ll help me get my 4-6 year old kids into programming. Gerv wants something similar but for twelve year olds. In my best of all possible worlds, there’d be an O’Reilly Radar reader out there with kids who wants to teach them how to program. That person would then document what works in book form for us. This site tells what to expect as an author if you think you’re that person.