I got this book for Christmas. After I got it I searched the forum to see if there was a thread for this book, and couldn't find one. I recently thought about starting it myself, but then procrastination got in the way.
This is a great book, though I can't tell if it has any information that's not on the Red Book site. Most of the info looks very similar to what's in the related Red Book articles, though I haven't gotten around to comparing them (I read the website every day). One thing to point out is that the book doesn't list any entries on dates where Jim did things for Follow That Bird, and the Red Book site currently doesn't, either (I would think he would have at least noted days when he was on the set). There's a number of pictures I don't recall seeing on the Red Book before, and before I got this book I don't recall knowing about there being plans to give Snuffy a younger brother in season 10.
I like the section at the end regarding the last two years of Jim's life. I assume that he stopped writing in the book because he had run out of room (but then why not start another book...?), but it seems many of the Henson productions that came out in 1989 (and even 1990) had started production early enough to be noted.