The first type of book is an e-book (or plain old Word document if you want to go that route) that is a collection of images that inspire, intrigue, or challenge. Beneath each image you will deconstruct its creation: lighting, exposure, depth of field, editing, as well as theorize on how to make it better. It'll look something like this:
Flash or Fresnel above and to camera right; ambient fill.
Medium depth; f/4-f/8; 35-50mm lens
Dodge and burned, darkened on the lower half
Fairly "un-posed." Face and smoke rings work on the diagonal, bringing focus to the subject. Arms at angles but not 90 degree.
The wide horizontal framing has an interesting effect, isolating the subject
Open the eyes further; dodge out the floating hands in the background; have light spill onto the back of his shoulders. Mostly I miss the eyes.
Each image will have the deconstruction beneath it. That's the first type of inspiration book.
The second type, which I use regularly, is a set of images I've found (through google, other photographers websites, blogs, etc.) that inspire me as examples of what I could be putting to use in my current work. These may include interesting poses, lighting, angles, environmental portraits, examples of theory put to spectacular use. I put these in a folder and transfer it to my phone so I can have them at my fingertips.
This group of images is ever-changing. I'll remove them after I've tried something similar or if I become bored with the image. I add new images constantly as I find them. When I book a shoot, I'll often go back and look through these images for ideas I can put to use.
I ran across a tip the other day that I thought was interesting. It hard to remember the different poses you thought up while in the midst of a session. You may not want to refer to your notebook (I often write my ideas down), especially if you're feeling nervous. Another option is to take a picture of them with your camera, so you can check them during the shoot without being noticed. To do it effectively, you want to format or delete your card, then take pictures of the poses on your computer screen. That way, your cheat sheet will always be the next image on your camera during the session. You won't have to hunt for them.
Happy V-Day, all.