All the images for my book are now available from the Rosenfeld Media Flickr site. I encourage you to grab them and pop them into your own presentations. But please be sure to mention where they come from: cite the book's title, my name, the publisher, date , and the book site's URL. Here's an example:

Figure 12.1 from Mental Models: Aligning design strategy with human behavior by Indi Young; Rosenfeld Media, 2008. http://www.rosenfeldmedia.com/books/mental-models/

Enjoy!