The brilliant Nibbler makes it easy for everybody to clip images from around the web. Find what you want, click it, and you can then use it in your slidebook. Simple as that.
Installing the Nibbler
Clipping an image
Adding the image to your slidebook
Drag the Nibbler button above into your Favourites.
Browse to any web page. Click the Nibbler button in your Favourites toolbar. Click some images on the page, click close when you're finished clipping.
Go to any slidebook, and the images will now show up in the dock under Your Bites. You can use them straight away on your slidebooks.