It is a pretty amazing CD...I was fortunate enough to be one of the "beta testers" of it, and I can tell you for anybody who enjoys tinkering with cameras...and anybody who thinks they'd like to learn about tinkering with cameras, or anybody who has a curious mind, it is well worth the price. You can buy it on Rick's website, and I think he and I've agreed to offer it as a solo item on E-Bay, too. If I remember correctly, there were about 1,000 scanned pages which went into the making of it.
Jon