I'm still working on Isaac's Quiet Book, and I've come across some more helpful sites. What I like best about them are the pictures. (That always helps me get ideas.) Here they are:
The Burke Family Quiet Book
Natalie Clayton's Quiet Book
How to Make a Quiet Book (this lady made a whole blog on how to make a quiet book!)
(And she has a few links on the right side to other quiet book pages)
Some day (hopefully soon) I'll post pictures of the quiet book I'm working on.